GP, if you are still concerned about being tonked by a Fast Jet you might consider making use of the CANP system. Put simply, you notify the low flying booking cell at RAF Wittering who then promulgate a warning to all crews booking into the LFS to look out for you. The contact details and more information are available at
http://www.caa.co.uk/docs/64/VFR_Guide_2007.pdf on page 35 (Low-Level Civil Aircraft Notification Procedures (CANP)).
Hope this helps.
Blunty