Was recently there in September for a week and later for a transit stop. We used Signature. Very nice facilitiy, friendly staff and hangar available for GBP 420 + per night. The airport can be tricky at minimum weather if you need to circle to land. Even good for fuel stop only (30 Min possible) Fuel only very little more expensive the e.g. Luton or Farnborough.
There is a Falcon MRO just next to Signature... I saw also Challengers in the hangar.
Hope that helps you
