Keep in mind Craig that most of the top pro's are also employed by thier respective factories and often do a lot of the team's R&D, so I guess it is feasable that they can practice every day - if not most days.
That last race at Littlehampton last weekend was a lot of fun though, if we did that more often it would improve all our driving
I've read also that if someone was to race 19t or mod at club level, they'll do better in stock at bigger meetings because you've trained your brain for the faster reaction times needed in the faster classes making stock seem slow.