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bobble-
A timely sale is worth an extra £12,500 to them (and £1,700 to you).
If there is something in the survey that is cause for concern - damp / rot / ancient burial grounds etc... that you think needs a discount on the price, and they tell you to jog on, it will cost them £12,500 (and it's an opportunity cost to you of £1,700, ceteris paribus).
This gives them an incentive to agree to a discount on the sale price of up to £12,500.
NotThamesWater
Which gives you a £12,500 -£1,700 sized stick if the survey shows up anything that needs money spending on it. You don;t have to swing it, but it will be nice to have.