Interesting as I'm sure mine were B6ECS - so you use a hotter plug. I was thinking of trying a hotter plug as if anything the B6's run a bit cold with the Mark Adams' ECU on my car.
Yep, Halfords don't stock them, or at least my local one doesn't. I had to get mine from a TVR dealer on Saturday as I couldn't find anyone who had them on the shelf. The dealer said they buy them by the hundred, as if they run out they can't get them locally either!