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I'm sure you've considered this, but when I bought my place in a very toppy market 2012-ish my valuation was £10k under the price agreed. I could just about scrape together the amount to cover the shortfall (increased deposit by £10k) and when it came to new mortgage time after 2 years the valuation had caught up and exceeded the price paid by a decent amount. If you want to move quickly and can find the funds from somewhere that would be the easiest solution...
The problem for me is that if the seller relisted, it would go above the asking price in minutes. The valuers have got it wrong. I spoke to HSBC and they won't reassess it, so I will look at other lenders.