Hi Guys,
Thanks for all your help, i have now solved the issue.
It seems that the golf comes with a slightly deeper socket (or the fascia is built up more) behind the gear stick, than in the boot oddly.
I found that when i pushed the Belkin connector into the socket and held it in place (To the point where i felt something was going to break), it would light up.
This gave me the idea to try an old Sat Nav connector in the socket, sure enough it lit up first time. The main difference being the length from the top of the connector to where the socket makes the connection. The Sat Nav connector must be at least 15mm longer.
I then tried the Belkin out in my M135 and sure enough it struggled to pick up a current. I then tried it out in my friends V40, where it worked without any issue

To solve the problem i bought a slightly larger connector