What engine size, spec, how many owners? Will do a private sale search..
If it comes out at £1200, and hes willing to give you a 3month warranty on any mechanicals (ie he fixes) then I'd personally take it.
Bare in mind that at 78k its probably due its second cambelt change. Clios have to be changed before manufacturers recommendations at 40k intervals? Also ALL electrics work.
Im assuming its the 98-01 Gen:
http://www.honestjohn.co.uk/carbycar/index.htm?md=1289
Edit:
1.2 16vs seem to be suffering a lot of timing belt failures at mileages as low as 36,000. Best to change the belts at 5 years or 40k miles max. On 1,149cc D4F 16v and D7F 8v engines it is essential to change the timing belt, tensioners and the water pump every 3 years or 36,000 miles (whichever comes first). Early timing belt failures not unknown on RenaultSport Clio 172s, so best to change belt, tensioner and all pulleys at 4 years of 40k miles whichever comes first.