Thanks for that tip - that is really useful. My normal travel is so simple I don't need to worry about fare rules, but this trip got me thinking.

How is it legal to sell a ticket giving only basic cancellation and change bullet points, and not provide the bulk of the contract (e.g. the full fare rule) in advance. Isn't that a basic part of sale and supply contract law? (e.g. there's nothing on the ba.com page that says I can't stay more than 42 days)