Paying the bill is not making a profit
Crystallise the £200,000 pot, take £50,000 as PCLS and designate £150,000 to drawdown. The £20,000 bill leaves £30,000 cash outside the pension. HMRC's PCLS rules require an associated entitlement to pension benefits and sufficient lump sum allowance; 25% is not an unlimited entitlement. The phased case crystallises only £80,000 initially, takes £20,000 and leaves £180,000 in the pension after paying the same bill.
This chart is an illustrative balance-sheet snapshot, not a projection or current rate. Both routes retain £180,000 after today's bill. Moving £30,000 outside the pension has not generated £30,000 extra. Our argument is about certainty of access to an already-committed expense, not a better arithmetic return.