Hello Nicky,
Take your chassis numbers and especially the oval plate number to your local Renault Garage (or phone Whitehouse Renault if your local delearship is unfriendly!) and ask for a nearside steering rack bush kit. They were around £11 and hopefully will still be available. The rack needs to be removed and dismantled to fit it - not a difficult job if you know what you're doing! If they are no longer available then you'll need to get a secondhand rack. The same rack is also used on the Mk1 5's if that's any help.
Good luck
Steve