Installing a cigerette lighter in corsa (old 1994 model)?

I want to install a cigerette lighter in a old corsa 1994 model for powering my mobile phone in the car, it currently just has a blank plate where the lighter should go. And I have read else where that it is a simple process to add and is just a connector found behind.

The problem I have is that the previous owner added a radio and appears to chopped the wires around a bit adding white connection blocks. The only connector I can find is one coming out the back of the radio tray (the bit the radio slids into) which is blue /white wire with a white connector on the end. Is this the connection I can use or should it look different.

If this isn't it any other ideas where I should look or be looking for etc.

Would be grateful for any help.

Regards
Chris