i sussed heal and toe-ing in the M3 and 330 but i find it really awkward in the clio, not sure if it's because my legs are bent too much as the steering wheel can be adjusted for reach. The pedal alignments don't seem to have been designed for a 6'3'' bloke lol. When I did the National licence I learned the basics from a nice instructor whom I can't remember now (was over 10 years ago)
I've since gone to a more authordox left foot braking technique that in the wet is too dangerous as i'm yet to master the 'not headbutting the windscreen' amount of pressure. Certainly not for road use that one lol.
As it was so met i left the PE2's on. They did the trick, didn't notice any major wear on them, even when it dried out a bit late in the day. A few people (including a Clio Cup racer) had R888's on and they were treading very very carefully.
I love Cadwell, there and Oulton are my favorite track for the clio. I used to think Thruxton was excellent but the Trophy's just not quick enough for the circuit.