I agree with Chirpy Pilot, as ex-OATS myself, I got constantly bumped to allow sponsored cadets to train, it took 5-6 months to do my twins training and I was available every day to fly.
There was also a marked difference between the quality of Tech and Nav instruction (the Tech instruction being considerably better)
OATS is a good school and it does look good on your CV in some respects..but don't go there just cause OATS has the advantage of being able to use "Oxford" in its name.
Its a matter of personal preference in the end, go to one of the reputable schools that trains sponsored cadets as well.. cause if the airlines accept the level of training there I figure it must help slight;y in the future.
And when you finish try to get on the ATP scheme in Southampton, they're you're best bet at a job but make sure you're completely ready before you go there.
Wherever you go you'll get messed around a bit.. this is "probably" the most peverse industry in the world when it comes to how you get employed...
email me if you want any more details on going from zero to ATPL (or at least my own story..:-) )