I'm getting
Sorry, something went wrong
Somebody must have purchased those flights while you were completing your booking and they are now unfortunately sold out. Please choose alternative flights or contact us
Repeatedly when trying to book some flights at the moment. Can go through the whole process again, perform safekey validation etc but still it fails.
Will try another browser/computer but still, what a joke!
Edit: Yep - no luck on another browser with all cookies/cache cleared...
Edit2: Yep - also fails on mobile.
It's a booking a long way in the future (almost at the date limits). There are reasonable prices and it's during next year's school holiday period so keen not to leave it for too long as it's for father in law's 60th-- I assume the best bet is to call BA and ask them to do it manually over the phone? I expect I can get any fees waived if it's not possible to complete the booking online?
Edit3: Found the root cause;
Called up, was told the price wasn't available (quoted a higher price). Website is saying R class on outbound and I class on return, expertflyer shows I0 for the return flight so for whatever reason, it's quoting a fare that doesn't exist / isn't valid. Blast.