You've misread my response. I asked the surveyor to cost the "issues" so I could make an informed decision.
Secondly, I haven't (yet) asked the vendor for any reduction in price because I haven't got an estimate for things that I couldn't see needed doing when putting in the agreed offer.
Thirdly, as a layman I need to get information. https://www.samconveyancing.co.uk/news/house-survey/rat-and-mice-infestation-231 seems to be the website of a bona fide conveyancing company, I have no reason to dispute the information there.
This is why I have come to a public forum to ask for help.
You have put in an agreed offer, now you are suggesting that you still want a lower price for the property !
Your location is Kent, I am sure there will be other prospective buyers prepared to offer the asking price