Thanks for your help and the info links!
I have tested the cable on a 56" Hitachi plasma and it had no problems although i still thought the colours where a bit "off" but this was corrected after fiddling with various display options on the tv.
I also tested the cable on a 42" Samsung LCD and that also worked fine and looked better than on the Hitachi with stronger colours and more clarity (Hitachi plasma is a few years old now).
I plugged the lead into the scart 1 socket on both flat tv's and it switched channel automatically and looked quite clean. When testing with standard crt tv's the colours where the same for all (washed out with reds looking more like orange etc...)
When i get a bit of free time i will try and make a diagram of the pinouts in my scart cable in and post it here, (anytime soon) thanks again