BombDr . I am just starting at 38 and have a mega + attitude that it will all come good . There is a thread running in the sticky at the top entitled "The perpetual am I too old" You will find all sorts of opinions there , some good some bad and some downright ill informed garbage .
One point you may want to consider is your medical. Now seek clarification on this , but you may be able to get one done through either an Army AME or seeing as your in Banbury nip over to Brize and get a RAF guy to do it . Im not sure if the CAA would accept it but certainly worth asking . I did my class 2 with an RAF quack and it was free .
Also if you have time left in the forces enquire at BZN flying school . It was at one time cheapest flying school in the UK . They accept civvy members but if you join whilst still in the army you will get forces rates . But it has been some year since I trained there . Worth enquiring though.
Good Luck