To be fair the guy who built them didn't refer to them necessarily needing re-tensioning, but just said to bring the bike back in after a few weeks, or if I felt they had gone out of tension for effectively a check up and tweak if necessary. I called it re-tensioning above just through my own ignorance in the whole hand building of wheels and what to expect after.
I should add though, that although I know he has done thousands of wheels over the last 20+ years, and that a lot of the local club riders use him, I don't actually know how good or bad a wheel builder he is. I will certainly check the wheels weekly to see if they have stayed true, but will have to trust at the moment that I haven't made a mistake in getting hand builts.
I find it odd that you are questioning the quality of hand built wheels . Would you question a set of wheels bought from a shop ?