I was thinking something along the same lines - I'm kind of assuming he wired it himself judging by things like the freezer on it's own circuit (a good idea) the emergency light (another good idea, although I'd probably have had it on a lighting circuit) and because there are so many circuits.
It would be nice to think that buying a house from an electrician would be a great thing because you know the electrics are the best they can be, not that it would be a bad thing because you need to pay his mate a fortune for an EICR.