As Elekie&ACdoc said, this is one of those occasional stupidly complex and costly jobs in the car world.
When Ford launched this engine, the cambelt was supposed to last the 'life of the car,' but then this was changed to replacing the belt every 10 years / 150K miles.
The price Ford quoted you is correct, apparently the job takes at least 10 to 12 hours labour plus parts, and requires expensive special tools too. As the Doc pointed out, you could just run the engine until it dies and then fit a good used replacement engine for about £1,500.
It is a gamble, it depends how much you like the car and want to keep it running
My 10 pence worth is, if you do decide to change the belt, it is one of those jobs that it's worth paying a main dealer to do, as they are more likely to have the special tools needed, and the main dealer price probably isn't going to be THAT much more expensive than having an independent mechanic do it. .
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