After some (much appreciated ) words of wisdom, I've ordered the following from Renault...

Shocks (front and rear)
Wishbones (including ball joints)
Top mount kits
Track rods
Wheel bearings (front)
Anti-roll bar bushes (centre and end)

That lot came to £425, plus some springs I picked up for £40, so it had better be worth the improvements over my sloppy used stuff! Can't wait for Donington

Next on the list is an uprated dog bone and the other two engine mounts...when my bank balance has recovered