I visited The Kent Battle of Britain Museum at Hawkinge in August 1999 and cannot praise it enough. It located in the old Hawkinge hangers and is very professionally presented with a wealth of detail about the Battle of Britain. If you are interested in the events of the Battle of Britain then this is one of the best places to visit. 
I have no connection with the dedicated people that run and manage the site other than admiration for the work that must have been put into the building up of the site. 
The displays are professionally presented out and give you a sense of what went on during those short, tense months. There is loads of interesting artifacts (2 Me/Bf 109's) guns uniforms, engines, planes, sound effects and in one of the huts a flying bomb (doodle bug). It is only a small site but there is so much to see it is impossible to list here. It is very easy to find, Hawkinge is located on the A260 about 3 miles from Folkestone and is well sign posted in the Village. 

Please if you are down that way go in and support the fine work that they have done the entrance fee is very reasonable and the folks running it are very friendly and enthusiastic.

Do not take your camera's, video's or any recording devices in to the museum. It is not allowed.
Address: Kent Battle of Britain Museum 
Airport Road, 
Hawkinge, 
nr Folkestone, 
Kent CT18 7AG 
UK
Registered Office: Kent Battle of Britain Museum Trust Ltd 
Highfield House
Maidstone Road,
Marden
Kent 
TN12 9AG
U.K.
Phone: [+44] 130 389 3140 
Directions:
Opening hours: Easter Friday to September 30th- 7 Days a wwek. The doors open 10:00am till 5pm. October - 7 Days 11.00am till 4.00pm
Facilities Free car & bus parking, beverages and snacks, and a shop.
Exhibits:
Replica Hurricanes, Spitfires, Messerschmitt Bf 109's etc. Remains of 400 Battle of Britain crashed aircraft on display. Military vehicles. Hawkinge was a very active fighter station during the Battle of Britain. The displays recreate the history of the Battle of Britain in 1940.
If you want somewhere to stop in Kent, try here

We found it OK, Friendly, Clean and comfortable, and reasonably priced.