Perrin's right. There's more to it than money. I left the mob, started off with an unlicensed job and was licensed and supervising in eighteen months. Twenty seven years later I'm still in the aircraft maintenance business and I've done OK. Not rich, not broke but generally satisfied. Aeroplanes tend to be in the blood and if they are, you won't be happy doing anything else regardless of the money.
The BTech will help you withthe basic theory you need to get through the licence exams. Make sure you get hold of RAF Form 6859 and get it filled in. That's the record of experience you'll need for the licence application. The B2 licence information is available
here on the CAA's website. Then go off and sit for your B2 ticket and get on with it.
Good Luck.