My Garden Blogspot Identify Please, 4 Aircraft Seen Today Performing Aerobatics Above Welwyn Garden City.

Identify please, 4 aircraft seen today performing aerobatics above Welwyn Garden City. - my garden blogspot

These 4 aircraft up to 15 minutes of ads, links, smoke, runs, runs ... All this is very impressive.
What I know is ... However, as the name of the plane, please.

I feel that my previous question was clear, and thanks for the replies so far.

Pictures at:

http://1.bp.blogspot.com/_1Aee858nZHU/SJ ...