This months issue has a really good review of the williams ........Heres a quote from the last paragraph.
"Maybe the effect on the Williams itself was marginal, but after 10 years development the current crop of 200bhp super hatches, good as they may be, weigh considerably more than a Williams 1 and cant hope to match its kart-like dynamics. To be fair to Renault Sport, the current Clio 182 in stripped out 1060kg cup guise is reckoned to be about as good as new hatches get, But when road tested back to back with a Williams on good form, the older car usually still gets the nod, having driven both it certainy gets mine".
Enjoy.....If you have a Williams the whole article is worth a read