Thanks folks!
Its probably fair to say that if i had just replaced the whole front end with standard 16v parts id have noticed a difference but i dont think itd have been as much as fitting the willy parts has made. Its unreal and the best mod ive had done IMO.
Paul C 16v: you wont be able to use your koni shocks as i think the bottom strut to hub bolt holes are at a different angle so your camber would be out. Then again, k-tecs camber correcting bolts may get round this....
Total cost has been bad in my case. I opted for all new willy parts from the main dealer and when i put the car in i was under the impression i could use R19 shafts - sadly this was not the case so have had to pay for them and the correct willy shafts. In all, labour came to about 270quid (day and a half) with all the extra faffing about. Parts came to about 500 quid or so.
If anyone else was to try it i reckon you could get the parts price down to about half that using a combination of s/h and new willy shafts and everything else from an R19 16V. If you could fit them yourself then itd be a really cheap. Unfortunately ive had to pay big time as there wasnt a lot of definative information on the subject - just a fair amount of guesses like "it should fit" and "i think my mate did this...". However, considering if you bought a decent coilover kit and had it fitted youd be about 500 quid or so this isnt that bad.....
Interestingly, i came accross a proper williams last night. Naturally i followed him as i wanted to compare mine to his and as he did seem to be pushing it. Road conditions were quite twisty with a mixture of low and high speed corners - where the superior handling and power of a willy would show but there was nothing between us. I think with wider track, the torque issue of the 16v seems far less aparent as it can be kept on the boil with far more ease - nice.