From practical experience of forty years in the aviation maintenance game, the only degree worth anything at all is one in bean counting...accountancy or one of the associated financial areas or marketing...
Look at the senior management of any big company and you will not find an engineering degree anywhere.
So you are going to blow £3000 on a degree course which really has no relevance; you will be screwed by the bean counters just as much as, and just the same as those without a degree but with a lifetime experience of hands-on...
Maybe with a major aircraft manufacturer such as Airbus, Boeing or Dassault a degree will carry some clout and indeed maybe a pre-requisite, but for aircraft maintenance all it's worth are the letters after your name...
pp