The UK Masters/KOTH play under the current Millennium Series rules. The main difference you will find is they use 1-4-1, 2-4-1 and 3-4-1s whereas the PA runs Sostas law and penalty points for things such as wiping, playing on, etc. etc.
Would'nt worry too much about it, a lot is explained to you on day and you'll pick it all up quick enough.