I wrote to BA recently, and they said that with the current 'future size and shape' initiative in action, it's unlikely that any external recruitment will take place in the forseeable future. But, it's true that a lot can change quickly in the airline industry. The best thing to do is keep a regular scan going on the ba recruitment website, and keeping in touch with FOD at BA wouldn't be a bad idea.
My guess is that when BA does restart the trainee pilot scheme, there'll be a million and one applicants per place...so definitely keep in touch with as many sponsoring companies as you can. Don't restrict your options in an industry which is highly selective anyway!!