You can't just hand wave away an independent surveyor. The number of professional surveyors in my area is surprisingly low, and if I were to pay for my own survey I would likely end up using the same form as the seller used (in my area at least).

There is also plenty of precedent for courts to side with the buyers in misrepresentation cases in the UK. The law has provision for 2 years in prison, and surveyors have been jailed previously for lying on surveys.