oneJohn is right , a Boundary Survey is the only way to confirm where the land actually is for both parties involved. Legally, they are the only ones who can, which is why they can charge so bloody much. Their reports are accepted by the Titles office as gospel.
The Surveyor will relate their measurements to the Title, and this will show if fences etc are actually on the true titled boundary.
Sorry to repeat, but a Conveyancer has nothing to do with, e.g. no responsibility for, physical checks. What many Conveyancers normally do is note in their documentation to the buyer, that it is recommended to the buyer to check the Title against the property, OR, employ a Surveyor to do so, at the buyer's cost. OR, as some do now, recommend Title Insurance. My conveyancer wrote all 3 options on my documentation. Your brother may like to confirm if that was included in documents sent to him.
Many people can and do competently perform all their own conveyancing, but a single error may have dramatic results. Each step must be done in order, and carefully checked and re-checked. You need to know exactly what to look for as well.
Like boosta I have lived and am still learning from an 18 month plus experience, which once it is all settled may become a tale of caution H1 thread.