Don't know, he was upset because they released "On Parole" 2,5 years later and until than he didn't know if they gonna release album at all, that's why he was upset, that's why people than talked about "Motorhead" album like first album, it was first album in the stores, first album to see light of the day but On Parole was RECORDED first, for me On parole is first album. In his book he said about album "this is part of story (Motorhead) too..." You have some bootleg with pretty much bad sound from first show ever 20.7.1975, their first working day like band.
I did some research on 'On Parole' some time ago and it was actually released in 1976. The UK release was 1979, but the first release (1976) was in Japan(?) and some very few other countries.