Fitted the gate valve and hey presto, hot water and hot rads. That is one i'll keep close to my heart for times to come!
Looks like I might have to play around with the lengths of 10mm though as the heat from the rads are not what I'd class as "optimum" but the lady seems happy. Although as the Flooring is all chipboard... blinking new builds... maybe i'll leave it and see how it gets on eh...??
Thanks for the help chaps, invoices in the post?
Stu.