If you chose to do Avionics at Glasgow, you'll be one of the last. The degree is soon to be replaced by an Aerospace Systems programme that better reflects the needs of industry.
Avionics in British Universities was the bastard child of aero and electrical degree programmes in the 1980's, just when fly-by-wire, glass cockpits and GPS for navigation looked as though they heralded a bright new and completely different aeronautical dawn. Didn't happen quite that way.
Avionics at Glasgow has suffered from a high drop-out rate over the years. Suggest you speak with the admissions officer to refine your choice and ask about the new systems programme.
Would a PPL help? Not at all. But there's nothing to beat an an engineer who can fly as well
