Thanks for info,but do not know how to inspect the belt to see if the writing on the belt is bright or not, not being a mechanic i would appreciate some
help on how to inspect the belt.Thanks very much for your reply, sorry to be a pain Tornado
To be honest I wouldn't put too much emphasis on inspecting the belt. They can look fine but be on their way out.
All you can do is look at it, twist it around and look for cracks.
Also, the belt could be ok but the water pump bearing goosed and it is often this failing that slips the belt off rather than the belt itself snapping.
I always go off miles/age. If you've bought second hand and don't know if has been done, my advice is to get it done for peace of mind.
Belt, tensioner, pulleys come as a kit. If you are really concerned get water pump done as well. Should be around £200 if you go to a good independant.
Hope this helps