When trying to decide between BMW, SAAB, Mercedes, Audi and Lexus put in something like 'Lexus Reviews' or 'Lexus problems' on google and on 2nd / 3rd page of the results was link to Lexus Owners club USA...from there got to the UK section.
Definitely worthwhile experience as have now ordered my 250SE with delivery date sometime in the summer (I hope). :)