It really depends where abouts in the country you are.
I don't race them myself, but we race them about once a month at milton keynes. The F1 nationals run alongside the world GT nationals.
This year it is planned to run a single 2 day national somewhere in the midlands (current favourite is Tamworth).
I'd suggest asking you have a look and ask your question here:
http://rcracechat.com/vb/forumdispla...-10-Pan-Car-F1
as a number of the people you saw at the autosport post regularly.