You will enjoy it, they run most of the aircraft, finding the entrance from the motorway can be a pain considering its by the motorway, so either use a GPS or write down directions.
Opens about 9 normally it kicks off about 10 ish, if you have kids earplugs or ear defenders might be a good idea as your standing on the side of the runway and they are using reheat, ie loud.. take a camera you will get some awesome pictures, you can also stand up on part of the bank at the end of the runway though can get a bit blowy with dust etc when the Victor does its thing, but you get stunning views down the runway of them doing their thing, all though not a museum in the sense of the word you can get around the aircraft based there, touchy feely, and some have cockpits open etc to view, there is normally burger van etc though you could simply sit on the bank, have a picnic and watch from there if wanted.. It's also a car storage so you will see the odd exotica about, there is a chrome painted Lambo that's parked outside, or was when I have been.
Bruntingthorpe Cold War Jets, this weekend
Cold War jets on display | This is Leicestershire
Open Days | Bruntingthorpe Aircraft Museum
Lightning Preservation Group Based at Bruntingthorpe Airfield near Leicester