For an extra fee you will usually be offered the option to arrange for the same valuer to carry out a more detailed “Home Buyers Report”. Because you have paid for this, you will be able to rely on the report if things go wrong. If for example a problem comes to light and this is not mentioned in the report you may have some redress against the valuer.
If the property is old or you are concerned about its condition you should seriously consider a full structural survey. This is more detailed than a Home Buyer’s Report and therefore will cost more.