No I haven't done them yet, new plugs are sat in the garage ready to fit,
Given the amount of effort it's going to take to strip the turbo and I think the exhaust manifold, I came to the conclusion that I would wait until it's more of an issue. Being lazy I know, but if it's not coming up at the moment then it a lot of work for not much gain.
Thanks for the reply..
Looks like a job to do only if essential