when it failed did it do so due to lack of oil, did it knock, or just stop,
you would from a garage be in realms of of £1000 uk pounds, plus cost of a engine link below £1750
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if oit just a snapped timing chain then repairing it is better option as even when install another engine you really should fit new timing chain before fitting it as these engines have known weakness with chains.
if chain gone £300 chain kit head set £100, 8 valves £70, 20 hours to change it and repair it all, good luck trying to a engine for that car with ultra low mileage for under £1500 at best, breakers know they can get a good price for them,, i've repaired many like this with timing chain failure,, but if its a oil problem and engine run low very low oil so oil light came on then yep new engine only way forward,, as these engines by design use oil it helps with combustion process and lubrication and with the coated low friction tech