Went to the CTC assessment yesterday. We were told about 1/3 of us had been selected from the batch of initial applications. Assuming a fairly even split of applicants across the FTO's (doubt it is but oh well!), then you're looking at around 1500 initial applications to each, so 30% of that is more or less 500 to assess at each FTO. Each FTO will put forward 100 applicants to BA for the final stage at Waterside towers (not Cranebank, the recruitment centre moved last week...). I believe OAA was the most popular FTO selected last year and I've no reason to believe anything has changed this year.
As for my assessment yesterday, I'm sat on the fence. Don't think I did badly but it all depends on the quality of the other candidates!