These were discussed a lot at Harry's competition class. Harry recommended them very strongly and several of the students were very interested in getting some.
I'm happy to arrange a group buy if people do want to save on shipping. I've already spoken to Chris at Cajun Bandit and he is more than happy to ship to the UK.
Link is here http://cajunbandit.com/wsm-parts-mods/
If people do want one, please post here with how many and what size (remember 2008 and older WSM's are different to new ones too)
I'll then get a quote from Chris and let people know by PM what the total cost is going to be.