A friend and I took a C152 into Bruntingthorpe a few years ago. Had to request permission by phone and pre-arrange arrival time. I seem to remember a nominal landing fee paid at the gatehouse. Quite a few interesting parked aircraft to view and there was a double decker bus selling souvenirs in support of the Vulcan project...but that might be gone by now. Unless things have changed, be aware of a few "gotchas". The man on the radio (the Security Guard at the gatehouse) was very friendly and accommodating but obviously not an aviation expert, offering a choice of runways regardless of wind direction....make your own decisions! On landing, we had to swerve to avoid a massive sheet of plastic that had blown onto the runway; I believe it's used for other purposes (car testing/racing?) and it's condition is not guaranteed. Plenty of space to park but we got it wrong and ended up in no-man's-land...you really are on your own so good pre-flight planning is essential. It was generous of the owners to allow us in and good to get a new field in the logbook.