I
ImayKnow
I haven't suggested that he does. My advice is to avoid going to court. But as far as small claims are concerned, expert reports aren't essential. Taking detailed photographs and writing a clear description of the problems is usually sufficient for a dispute of this size. The evidence requirements in a small claim are not as rigid as in other courts. Judgement is made on the balance of probability. Spending a significant sum on an expert report for a claim of a few hundred pounds might not be viewed favourably.
The trouble with SC courts is the adjudicator may not have any knowledge of the subject matter, and could, for example, look at those photos and think 'it looks very nice' hence professional independant reports would have a significant amount of influence in the ruling. This particular issue could well end up in the SC Courts.