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Ok the 1st thing to establish is if the valves have hit the pistons as this is an interference engine and a broken belt does mean its very likely the the cylinder head will have to be removed and valves replaced
possibly the head may need machining to repair damage and clean up seats and guide
so if just the valves need replacing then budget about £300 in parts ( valves, gasket and belt with new tensioners) plus a days labour to remove, strip and rebuild the cylinder head
so depending on your garage's labour rate then then will deterimine the overall cost