Dummy booking exactly the same flights + hotel three times led to three different prices: ca. £980, £1,400 and £1,700.

Every dummy booking was in Euro Traveller, but on adding the hotel the cheapest one moved the flights into Economy Plus.

Naturally I re-started and tried to book the £980 option, twice. Both times post at the final stage received:


Errors
We’re very sorry, there has been a problem confirming your booking. Rest assured we have not taken any payment.

We’d like to help so please call 0344 493 0787 in the UK or 1-800-247-9297 in the US


Will 'phone them in due course, but is this just the BA website getting itself a bit confused and offering a price that doesn't exist? Naturally the process involved three different design schemes....