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The cam belt and its ancilliarys should be replaced every 70K miles or 5 years whichever comes first. Prices for a decent replacement job can vary depending on the garage and engine type - so it may be worth asking around first.
I have heard of figures of £200 to £600 quoted and that may not include VAT. If the car has been serviced at a renault dealer they may be able to let you know its service record although they are not obliged to do so.
Currently in madnoel10's garage:
Honda Civic 1.4l