Civil Airfield Duxford (EGSU)

Outside airshow dates you can (with PPR) always land and visit the museum. Even then, historic aircraft are often up on training missions and test flights, adding to the atmosphere. For a relaxed first visit covering all exhibition hangars and the outdoor areas, plan about 4–5 hours. The aerodrome has a wonderful aviation ambiance; you can freely walk from hangar to hangar and view all the aircraft up close (almost everything that flies, or once flew, is here). The mix of museum and active, calm, professional flight operations is fantastic and unique in Europe.

Museum admission at about £25 isn’t exactly cheap; still, it’s worth it. Moreover, admission for up to 2 hours for fly-in pilots and their passengers is included in the landing fee (£25 for all SEPs), and there is no check on how long you actually stay. Very wide-ranging exhibits. Overnight parking is a hefty £24; possibly cheaper on grass. On the field there are a few typically British self-serve restaurants with below-average food—better skipped.

All purely aviation info is here: https://www.iwm.org.uk/visits/iwm-duxford/pilots. Unfortunately day VFR only. Telephone PPR is strictly required (and the aerodrome doesn’t open until 10:00 local in the morning, so you should ideally obtain PPR the day before). The local area is, of course, noise-sensitive. Day visitors are usually parked on the eastern portion of the asphalt apron north of the runway. From there you walk through a small red gate into the museum area. You pay the landing fee at the ticket and merchandise shop at the museum entrance. Even when arriving from abroad you do NOT necessarily need to go to the "C," i.e. the tower, after landing; the aerodrome has an agreement with Border Force that the FISOs will simply check during disembarkation that the number of occupants matches the GAR form.

Commercial sightseeing flights on historic aircraft are also offered from Duxford, e.g. on the Tiger Moth and other, even more exotic (and much more expensive) types. The company is called Classic Wings: https://www.classic-wings.co.uk/.