I think it's overpriced.
I don't have all that he's got, but I have all Oriole, London, Fontana & TMG singles up to 899 (admittedly some are in only VG condition and a total of 6 of them have NOC), plus all LP's (both stereo & mono where they exist) up to TML12033 and I wouldn't value the whole lot at more than £10k tops.
Not that I'd ever sell them
Phil