Its a Momo Race Evo in Aluminium finish - You can get a chrome one too...
It was £45.99 from Tweeks (Remember to ask for the lift reverse model) - I work just round the corner
Getting the old one off was a pain - Renault must use very good glue!!
Its not for the faint hearted, but heres a quick guide:
Remove the silver sinsert from the top.
Take a junior hacksaw... and start cutting stright down the middle until you reach the metal stick.
Rip off the leather surrounding the rubber / plastic inner piece.
Then saw off as much plastic as possible until you can fit a pair of mole grips on to the remaining plastic.
Then grip your mole grips around the remaining plastic and yank to the left or right - this should break the bond on the glue and the remaining plastic should be free to lift off.
You can now fit your brand new knob - mine had a grub screw which is tightened once the knob is in place.
As for the surround, it is a Richbrook one - it actually screws in with supplied screws (Not slef tapping). I found that they all screwed in to the gap between the gaitor and the plastic surround - dead easy and looks great!
If you need any more help - PM me.
Cheers!