Andy Mac spent a couple of years in the Alchemicals who attracted a fair bit of label interest and released one single when he was in the band on a V2 subsidiary label (can't remember which). Bassist was Nathan Fisher, another Bassett alumni who went on to the Tears (Bernard Butler & Brett Anderson's short-lived band a few years ago) and is now in World Party, who by all accounts don't do very much.
This probably puts Nathan just ahead of Richard Davies and Nick Smith in terms of 'who-from-our-peer-group-has-done-the-best'.
Since the Alchemicals The Mac (as he's become known these days) has fronted a band called Uncle Mac's Circus Sideshow, who mainly did odd combinations of covers (eg 'Hello' by Lionel Richie, seguing into 'Smells Like Teen Spirit' via the 'Hello, hello, hello, hello' refrain). He's got something new in the pipeline at the moment and he's trying to lure the Perrett brothers into joining (seriously).
I should be seeing him after Xmas so I can update then. He's also spending Xmas itself in the Swindon area so keep your eyes peeled.