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In Scotland things can go for outrageous amounts over valuation (see my post upthread).
I believe I've seen, but can't find an example of, a surveyor valuation with a caveat that the market conditions are disrupted and valuations need to be regularly reviewed. Whether this means they'd entertain a re-valuation at very short notice just due to market pressure I have no idea, and I'd be fearful not.
If its a physical survey being done by a chartered surveyor they will have what is known as a 5pc bracket. That means they can sign it off with a 5pc margin for error on their part, without the risk of being sued for negligence. 30k over at 350 does sound a little punchy to me but stuff in East London goes under offer for over asking quite often. One I saw the other day was a house at 950 and it sold for 1025000.