You'll probably need to come over to this side of the pond to do it, but both the Commemorative Air Force (formerly the Confederate AF before the name become un-PC) and Collins Foundation offer flights in WWII vintage aircraft - B-17, B-25, B-29, and P-51 (that I know of, probably others are available) in return for a 'donation'. I flew on the Collins B-17 about ten years ago and loved every second. At the time it was about $450 for a 30 minute flight. It's not exactly a big money maker - I did the math and with the ten paying passengers they did little more than cover the operating costs.
Check their web sites for details, and where they are going to be over the summer.