Ok im just about to answer my own question!
For anyone whos interested, theres a website of this company. Stupid me didnt think of looking before!
Its quite simply
http://www.securon.com/http://www.securon.com/
They seem to have replacements available for loads of cars, luckily that includes clios!
It looks like the costs are as follows:-
Front belts (2): £51.90
Rear belts (2): £51.90
Centre rear belt: £45.20
Personally i wont bother with the middle belt. Will just remove my original one & pop it back in for M.O.T.s, as its easy to take in and out.
Ill be onto them asap to find out if the fittings are definitely the same.
Lookin good though! About time summut went right!
Al