Executive Succession Planning Guide

Most boards discover they have no succession plan on the day they need one. The chief executive resigns, is approached by a competitor, or becomes unwell, and a process that should have taken eighteen months has to be compressed into three — usually while the business is already unsettled by the departure.

This guide sets out how succession planning actually works at board level: who owns it, the difference between emergency and planned succession, how internal pipelines are built and assessed, and what the Governance Code expects. It is written by Exec Capital, who advise UK boards on composition and succession.

Who owns succession

The Chair owns it. Not the CEO, not HR, not the board collectively in a way that means nobody.

The UK Corporate Governance Code is explicit that the board should establish a nomination committee to lead the process for appointments and ensure plans are in place for orderly succession to both board and senior management positions. The Chair normally leads that committee — except when it is dealing with their own succession, where the Senior Independent Director should take it instead.

The Code applies on a comply-or-explain basis to premium-listed companies, but its provisions have become the default expectation for private and investor-backed boards too. Private companies without a formal nomination committee should still name an individual who owns succession, because responsibility distributed across a board is responsibility nobody exercises.

One uncomfortable point worth stating plainly. The incumbent CEO should contribute to succession planning — they know the internal candidates better than anyone — but they should not control it. A chief executive who selects their own successor has, in effect, extended their tenure by proxy.

Three types of succession, three different plans

Boards frequently conflate these. A developmental plan — a talent grid reviewed once a year — is not an emergency plan, because it names people who could be ready in two years rather than someone who can chair the executive meeting on Monday. Every board should have a written emergency answer for the CEO and for each executive whose absence would be materially disruptive.

The emergency plan

Four things, on one page, reviewed annually.

A named interim. Usually an existing executive — often the COO or CFO — or a known external interim who can be engaged within days. Name a person, not a role.

What they can and cannot decide. An acting chief executive with unclear authority is a business in suspension. Set the limits in advance: what proceeds normally, what pauses, what requires the board.

Communication sequence. Who tells the board, the executive team, employees, key customers, lenders and investors, and in what order and timeframe. Departures leak, and the business that controls the narrative fares considerably better than the one reacting to it.

Filing and governance steps. If the departing individual is a registered director, their resignation must be filed at Companies House, and any replacement appointed formally. Bank mandates, signing authorities and regulatory notifications follow. In FCA-regulated firms a senior management function cannot simply be transferred — approval requirements apply, which is why urgent SMF appointments need planning rather than improvisation.

Building the internal pipeline

Internal succession is cheaper, faster and lower risk when it works. It fails for predictable reasons.

Assess against the future role, not current performance. An outstanding divisional MD is not automatically a chief executive candidate. The distinguishing capabilities — capital allocation, investor relations, board management, appointing and removing peers — are not exercised at the level below, so past performance is weak evidence.

Give people exposure that tests them. Board presentations, investor meetings, chairing a committee, running a genuinely difficult negotiation. Candidates who have never been in front of the board are being assessed on hearsay.

Be honest about who is not a candidate. The most damaging succession failure is allowing three executives to believe they are in contention when only one is. Two will leave when the announcement comes, and they will be the two you least wanted to lose.

Benchmark externally anyway. Running an external search alongside internal development is not disloyalty; it is how a board establishes what the market offers and whether the internal candidate is genuinely competitive. Tell the internal candidate you are doing it and why. Handled openly this strengthens their position; handled secretly it destroys trust.

Internal or external?

The decision should follow from what the business needs next rather than from loyalty or convenience.

Internal suits continuity. Where the strategy is working, the culture is sound and the requirement is to keep going with more capability, an internal appointment carries lower execution risk and lands faster.

External suits change. Where the board has concluded the strategy must shift, a new market entered, a cost base restructured or an exit prepared, an internal candidate carries the history of decisions they helped make. Asking someone to reverse their own strategy is a difficult brief.

One caution about the internal option. A promoted executive inherits peer relationships that must now become reporting lines, and that transition is harder than boards expect. It should be addressed explicitly at appointment — who reports to them now, what changes, and what happens to the unsuccessful internal candidates. Leaving it to settle naturally usually means it does not.

The timeline for planned succession

Eighteen to twenty-four months is the realistic window for a CEO transition handled well. Compressed timetables are possible but they narrow the field.

Months one to three. Agree the specification — what the business needs from the next chief executive over three to five years, which is not necessarily what it needed from the last one. Assess internal candidates against it honestly.

Months four to nine. Development for internal candidates; external market mapping in parallel. This is where a board learns whether its internal option is competitive.

Months ten to fifteen. External search if proceeding, and formal assessment of all candidates on the same basis. Exec Capital typically delivers a shortlist within three to seven working days of the brief being agreed, though CEO processes then run longer through assessment and reference stages.

Months sixteen to twenty-four. Appointment, announcement, notice period and handover. Overlap between outgoing and incoming chief executives should be short — four to eight weeks — and the outgoing CEO should leave the board entirely unless there is a compelling reason otherwise.

Where the timetable collapses, an interim CEO is preferable to a rushed permanent appointment. A permanent decision made under pressure is a decision made for the next six months rather than the next six years.

Succession below the CEO

Boards concentrate on the chief executive and neglect the layer beneath, where the practical risk frequently sits.

The test to apply to each executive role: if this person resigned tomorrow, what would stop working, and for how long? Roles where the honest answer is “several months” need a plan regardless of the individual’s intentions. That commonly includes the Finance Director in businesses where reporting depends on one person’s knowledge, the technology leader where architecture lives in someone’s head, and any role holding a regulatory permission.

Documentation is the cheapest mitigation available and the one most consistently deferred. A finance function where only one person can close the month is carrying a risk that has nothing to do with that person’s performance.

Six ways succession planning fails

Starting when the resignation arrives. By then you have lost the time in which a considered appointment could have been made.

Letting the CEO run their own succession. Contribution yes, control no.

Confusing a talent grid with a plan. Names in boxes are not an answer to who chairs Monday’s meeting.

Assessing internal candidates on current performance. The next role requires capabilities the current one does not test.

Secret external benchmarking. It always emerges, and the internal candidate concludes — reasonably — that they were never genuinely in contention.

Keeping the outgoing CEO on the board. The new chief executive cannot establish authority with their predecessor in the room. The Code discourages a CEO going on to chair the same company for related reasons, and the logic extends to a non-executive seat.

Frequently asked questions

Who is responsible for CEO succession planning?

The Chair, normally through the nomination committee. The Governance Code expects boards to ensure plans are in place for orderly succession to board and senior management positions. Where the Chair’s own succession is being considered, the Senior Independent Director should lead instead.

How far ahead should a board plan CEO succession?

Eighteen to twenty-four months for a planned transition. An emergency plan — a named individual who could hold the position immediately — should exist at all times and be reviewed annually regardless of whether any departure is anticipated.

Should the outgoing CEO help choose their successor?

They should contribute, particularly on internal candidates whom they know best. They should not control the process or hold a veto. A chief executive who selects their own successor has extended their tenure by other means.

Should we tell internal candidates they are being considered?

Yes, and be equally clear with those who are not. Allowing several executives to assume they are in contention when only one is guarantees losing the others at announcement. Honesty early costs less than surprise later.

Should the outgoing CEO stay on the board?

Generally no. The incoming chief executive cannot establish authority with their predecessor present, and the board’s ability to assess the new strategy objectively is compromised. A short handover of four to eight weeks is usually sufficient.

What if we need to move faster than the timeline allows?

Use an interim. An experienced interim CEO can start within two weeks and hold the position while a proper search runs. A permanent appointment made under time pressure is the most expensive shortcut available to a board.

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