Hopefully i can help..
What engine size do you have? petrol or diesel?
What year and sort of mileage does it have?
Have you any knowledge of when the belt was last changed etc?
Hi..there thanks for getting back..
Ok..If at any point the Timing belt does break then you do run the risk of internal damage in regards to the valves - the engine is classed as an interference engine which means if the belt breaks or slips off or hant been installed correctly the pistons will come into contact with the valves and thus depending when and during when it broke then you will most likly have several bent or damaged valves..and that is where the bulk of the cost comes in im afraid..as it does involve the cylinder head to be removed and basically reworked with new valves etc before it can be put back on with of course a new headgasket set - aswell as new timing belt inc the balance belt - this engine has two timing belts - and not forgetting the tenioners/guide pulley aswell that the belt run over and around too....Uusally the sign if the timing belt has broken is if the timing cover is removed it will be loose/or if you flick the starter over in short bursts and the camshaft does move whilst looking in via the oil filler neck then again the belts gone or the engine sounds or spins over too fast..Im sure you will understand too that alot of garages across the uk do tend to vary alot in regards to labor times and what they charge per hour so it would generally need to be a case of phoning around for the best quote to be honest seeing as you know exactly whats wrong with it and have an idea what sort of work will need to be carried out to get it back on the road.the job itself wont be cheap,you would need to bear that in mind and it is just unfortunate the belt wasnt checked or asked about before you bought it..as they need changed nearing every 50,000miles or every 60months which ever comes first..the total time roughly to do that job would be in the region of 8-9 hours not inc parts/vat etc - as approx ball park figure i say you could be in the region of £800-£900..but again as above i wouldnt just take one local garages quote and stick to that.maybe phone about other local reputable garages and see what they charge and try and get it done a little cheaper..maybe look and se if you have one under the this site http://www.goodgaragescheme.com/ I do hope this helps further..