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Originally Posted by acoolwelshbloke
Send them a bill for £10 after all they charge you if your not their when the turn up! 
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Seriously, do that.
They subscribed to the terms and conditions of the contract just as you did.
If they refuse to pay then ask them what your recourse is in respect of their default.
If, as I suspect, they tell you that the engineers are not their responsibilty / third party then ask them why you would be expected to pay in the event of a default on your part to someone who is not party to the contract.
Post their answer here.