As a follow on to Benson there is another date for the diary, well two dates actually Sept 9/10th at Keevil Airfield just South of Chippenham.
Its the Second circuit that I ever rode on (NG practice day 1998) and was once a regular venue on NGs race calender.
http://www.ngroadracing.org/phpBB2/viewtopic.php?t=3014 It looks as I may be able to make this funds permitting and if there is still space