I appreciate that AJC, but I still have a couple of unanswered questions.

I fully trust the last person I bought one from on here (and plenty of people on here will vouch for him), but it packed up working inside 2 weeks of being fitted according to instructions. I accepted it as my loss due to me not having it fitted for 2 months after purchase.

I'd therefore rather ask the questions in advance as it will be fitted asap this time.

cheeRS