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Not possible, everything is agreed on the exchange of contracts, so I'd have no way of doing that.
That's crazy, the London market has softened off a lot - but if we don't get into transition talks by December then the banks will all flee and our economy will take a big dive.
You might be committing to buying a house that has lost 100k before you ever get the keys.
Which I am sure is what the seller wants to insure against - by getting you to buy before the market (potentially) tanks.
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Not possible, everything is agreed on the exchange of contracts, so I'd have no way of doing that
I'm sure it would be technically possible to agree the sale on a floating index (house price indices certainly exist). They definitely won't agree to it mind.
Appreciate that as a buyer you'd risk forfeiting your deposit if you pulled out after exchange - but what would the seller risk if they did the same (between exchange now and completion in March).
I can't imagine they'd lose that much, so the risk in this situation is seems very asymmetric. You should, at least, demand a premium for that (possibly in the form of rent or your own deposit from them). Again, they won't agree to this either.
I'd say "that's great, actually - I'm expecting the continuing pressure on house prices from Brexit to have really pushed the market down by that point, so I'm happy to agree to this as long as we complete at the market rate on the day".
Then offer them £200k under your current bid in the day they emigrate.
(I don't know if this is legally possible btw).