Pyreegue currently offers four UK airports (Edinburgh, Glasgow, Belfast Int’l, East Midlands — with Birmingham on the way) and they’re among the most detailed ever created. They’re not cheap (so perhaps best waiting for a quarterly sale) but they are very highly regarded and run surprisingly well on the Xbox Series X (although East Midlands requires a little bit of caution).
UK2000 offers a decent selection too, and while they’re not as detailed as Pyreegue’s, they suffer no performance issues on console.
A few other decent UK airports are:
Pilot Plus Bristol/Southend: detailed sceneries but prone to black screens on Xbox
IniBuilds Southampton: one of the top 5 most detailed airports in the sim, and a solid performer on Xbox
IniBuilds Heathrow: decent performance and detail, given the size of the airport
IniBuilds Stansted: not one of Ini’s better offerings but still decent. Reasonable performance on Xbox
IniBuilds Leeds/Bradford: another beauty but probe to black screens on Xbox
IniBuilds Luton: beautiful airport but no Xbox experience
Origami Gatwick: avoid at all costs! Terrible on PC, let alone console!
Macco Sims Manchester/Birmingham: old sceneries but pretty decent and run very well on Xbox
Taimodels Manchester: no experience with it personally but supposedly not great. Nice interior, though!
Finally, if you’re into small airfields (as well as Farnborough), Burning Blue Design offer some fantastic examples in the Midlands and South. Unfortunately they perform much better on PC but they’re still enjoyable on the 'Box.