Your RICS Homebuyer Survey and
Valuation will explain what work should be done to your home and
its value. This should avoid unpleasant and costly surprises
after you move in. Once you have it you can reconsider your
offer. You may decide not to proceed with the purchase,
especially if there is a major problem that you do not want to
spend time and money resolving. Or you may renegotiate the
price, as you can use the survey to pressure the seller into
reducing the price.
Here’s a link to help you.