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As others have said, pushing down the price at the moment could be a struggle.
I think it depends on the circumstances. We got £10,000 knocked off the price after the bank valuer said the flat was worth £20,000 less than we had offered. I think their valuation was plucked out of thin air as there hadn't been many sales on the estate recently. The estate agent had a long meeting with the vendors and explained our situation to them. We would have walked away if we hadn't got a reduction.
We have just completed the purchase today after four months of (unrelated) legal complications.
As others have said, pushing down the price at the moment could be a struggle.
On the other hand you don't want to buy somewhere and discover it immediately needs £40k of work to be made safe.
For the price you may as well.
There is the in-between option of a homebuyer's report. Gives some info but there will also be a reasonable amount of "this could potentially be an issue, have an expert look at it". Depends if you're happy with that.