Circuits and bumps as my dad used to call it with the aircraft that constantly circled around RAF Lyneham, plus various visitors; as mikertroid says it’s training exercises at unfamiliar airfields. I really miss Lyneham as an operational airbase, although there are still aircraft around, just not in the numbers there used to be.
However, where I work in Westbury there’s always aircraft of one sort or another around, sometimes ridiculously low, mostly helicopters, but occasionally big transports like the Airbus A400 that went over the other day; managed to grab a quick photo at 2x zoom on my phone. Shows the multibladed prop blades nicely.