You can't just pluck an arbitrary figure out of the air, if completion isn't on time: the amounts have to be justified (hence L&A). If, say, you were having to live in a caravan and pay rent while work was being done on your house, then it would be reasonable for the clause to include the cost of the rental, as that is an additional cost to you. You can't get dosh out of the builder, just because you're gipped that it's over-run: in other words, you have to suffer some form of loss (the use of it as an amenity may well be a consideration, of course).
Yes, I was only musing. It's come along well, although since I posted this AM, I now learn that the internal door will not be fitted until tomorrow, but at least now we can see light (pardon the pun) at the end of the tunnel.
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