The '100 Club' lists all 100km (straight line) flights flown in the UK
John Silvester 's current UK record track 2007 (Gradient Avax)
Gradient wings have been used on 1 in 4 flights (23%); Gradient is more popular than any other manufacturer by far. They also hold the current Scottish, English and Welsh (UK) distance records.
Click on the following links to have a look!
http://www.cloudbase.me.uk/xcleague/100club.htm
or
http://www.cloudbase.me.uk/xcleague/100Club2.xls if you want to search the database.
This statistical analysis is courtesy of Richard Westgate - current Tandem world record holder (Gradient Bi Golden). 2008