I think it will definitely have an impact.
In the past to avoid having surveys done on every house they attempted to buy people put offers in and then had their valuation done. The valuation could be lower than expected but they had gone that far so carried on with the purchase. Don't forget silly mortgages were available then. Now buyers will know the value BEFORE they make an offer and if lending criteria is stricter who in their right mind will be offering over the asking price?
"who in their right mind ... "
Someone who REALLY wants a particular property, and who REALLY wants to outbid everyone else.
Unlikely to happen with a plain vanilla Bellway, David Wilson, or Redrow new- or recent-build, or an ex-council house that was bought 3 or 5 years ago, but for a distinctive, unique property, there's every possibility of competing interest bidding way over the Home Report valuation, isn't there?