Guys,
Thanks for your help, mirror is now replaced and working excellently.
Fitting the mirror is easy enough, stand at the back of the mirror (after prying off the housing, it is clipped on so comes off easy enough)
At this point the main body of the car is at my right hand side, ensure the mirror is still in the same position as when the mirror was removed.
Connect the clips on the right hand side of the mirror (as you see it), then to connect the clip on the left hand side.
Press the left handside of the mirror, then reaching through the largest hole in the rear of the housing bend the panel into the clip into the left handside (It flexs quite easily)
Hope this helps a bit,
Chris aka BoobBoo