Thanks for the reply.
I understand that they may not want to rent out to me, but that is not what they are saying. They are saying that it isn't even legal/possible.
I plan on having a long relationship with this flight school as they are local and I flew with them a few times before I got my FAA license. I do hope to convert one day to a European license.
Before they rent to me I want to have a few lessons flying in the UK airspace as the telephony is completely different to the USA.
All I need to know is that it is legal to fly in the UK in a UK registered aircraft on an FAA license, because then I can build a relationship with the school from there.
The reply above from the FAQ section is great! thank you very much!
But it says the permanent validations will only be until 8th of April 2014?
And then after that the validations have to be issued individually.