I can't believe you found a picture of that card, I looked forever. But, since I posted I have had the weekend to play with it.
I ran the most graphics intensive programs I own, for as log as I could. Then I removed the card as fast as I could and attempted to remove the heatsink. It has a bracing bar across the back, so i took it off and started gently pulling.
It took some elbow grease but I finally got it. When I removed the heatsink, I realised that the damn thing is held on with like some sort of thermal glue (which barely worked). And there was a super adhesive putty strip across the memory.
What a horrible heatsink solution. It took me an hour to clean off all that glue crap, but I got it, and I thank everyone for trying to help, I appreciate it.
