Hi!
I am not a member of cabin crew, just a mere student, so you may want to get this confirmed by someone else.
However, I think the min requirements for the majority of UK airlines is 5 GCSEs at C and above including Maths and English. Fluent written/spoken english is obviously a must have! Not all UK airlines require a second language but some do, it helps anyway... Also, I believe that for some BA cabin crew positions you must have an additional qualification in some sort of care work or somthing (haven't a clue what sort though....sorry!)
I think your best bet is to go to specific websites for each airline, that way you'll know for sure. Also, you could try aviation job websites, these almost always state the min requirements without further enquiery.
Best of luck to your friend,
LFG
