Thanks for info. Now I know that I can go for it. I have UK CAA issued Class-1 medical and icao level-4 certificate from mayflower collage which is approved from UK CAA.
By the way I'm going to Malaga AErodynamics to convert my IR to EASA one. Due to new EASA mess, I should check all the documents I need before fly to Gatwick.
In other hand many guys going to aerodynamics for IR conversion I hope and I expect that school has all necessary information and paperwork for students not to have any problem in Gatwick