He doesn't play on Erpsongs at all and I'd say 1/3 of the rest it's him, as far as the tapes are concerned. After that there's a lot of Ed too, Jurassic lots of Zia. But he gave them a driving edge, especially live. Love his playing.
Yeah, it was quite a revelation when people (on FB Ozrics group) asked Ed about early stuff vis-a-vis bass and how much of it is actually Ed! If i remember right, and feel free to correct me, Symetricum is one such case.
All the time I just assumed it was Roly on everything up to and including (some of) Jurassic Shift.