Easyjet fly into Gatwick which is the best place to start your UK Senna tour. Again Economycarhire provide the best car rentals.
Senna raced with English teams throughout his career but in the Uk there are only a few places i know he has visited or are connected with him.
Williams, the team whose car he died in have a Museum, details can be found here. The trip costs about £60 which is on a par with McLaren and is about 50 minutes from Gatwick Airport. The only problem with McLaren is you have to be a member of Team McLaren, and then apply for places to visit the McLaren Technology Centre which is like a raffle. I have been lucky enough to get a visit to the MTC and it lasted about two hours and was worth joining Team McLaren for.
Donington Park where you can see Senna’s cars is about three hours journey from Gatwick. This is well worth flying in for but the journey up the M1 is a pain in the butt. It is however worth the pain in the butt.