John Warrillow’s Built to Sell is a short business fable with one test at its heart: if you were not here, would this still work? That is also the estate planning test. A business that depends entirely on its owner is not an asset that can be passed on — it is a job that ends when the owner does, and families discover it at the worst possible moment.
His argument is that most owner-managed firms are unsaleable for reasons the owner thinks are strengths. Being a generalist who says yes to everything creates a business with no repeatable process and no premium. So: pick the one thing you do best, document it as a named process a trained employee can deliver, build recurring or contracted revenue rather than one-off projects, and stop being the best salesperson in your own company — hire two, so there is a benchmark.
The succession parallels are direct. A documented process is transferable; knowledge in your head is not. Customer relationships that exist only in your phone are a valuation risk and a family risk. Contracted income keeps a family solvent while probate grinds on.
The tax content is American — UK owners need BADR, CGT and the £2.5m Business Relief cap applied locally.