Landing in Luton area
this response may be too late...
I fly from Graveley & hence familiar with the Luton zone, I read all the posts, great suggestions, but, no one has mentioned that you need permission to enter the zone (which has been refused in the past) and strips like Rush Green are very short with buildings at one end etc. If you have no strip experience be very careful. if you are in a typical cessna or piper etc. you need to be well aware of your landing & take off distances. Luton will accept you - try calling Sean at Eagle Flight Training for advice. If you elect to go to Rush Green they are very friendly.