Connector for towbar electrics on X Trail

I knew it wouldnt be long before I was reaching out to you all for soem assistance :

The new tow bar has arrived and to keep costs under control I didnt opt for the vehicle specific wiring loom (£56 + VAT!). I have the cable (7 wires) coming from the 7 pin socket and under the X Trail I have found a square 6 pin socket that looks as though it runs from the rear lights wiring loom from with the boot. The question is, is this specificall for the tow bar electrics, and in the absence of the female connector (which wasnt supplied with the tow bar because I'm a cheap scate!!) does anyone know where I can get one (local stealer not interested) or what the corresponding colours are so I can branch into this loom (assuming it is for the tow bar elcetrics) and I'll do it myself withoiut looking for a socket.

Here's hoping (although looking at the lack of X Trails and number of Terrano's I suspect I amy struggle - go on - prove me wrong : )

Peter