Do the degree you think you enjoy most and are most interested in.
Quite a few aero eng degrees in UK are accredited by IMechE and Royal Aeronautical Society. From what I’m told it is possible for aero to apply for aero or mech jobs. Also mech can apply for mech or aero jobs although possibly not some aero jobs that need aero eng degree. Aero industry requires people from lots of disciplines not just aero so they need aero, mech, electrical, computing, software eng etc.
Honestly you should not restrict your job search to one city but is up to you.