Callum,
I would suggest Glasgow base is quite safe, it certainly is a core easyJet market and has been on their map since day 1. In the main UK bases have not been closed, with the exception of East Midlands (which struggled and was a Go inherited base), and of course Doncaster, which was clearly an experiment and was not in the typical sense a base...crew ex LPL... easyJet will fight hard to hold onto what they have in the UK, imho..