"One More Heartache"

Ah, the resurrection of Pigboy Crabshaw, a great album, but two things have vexed me this last quarter of a century:

1. A gave a guy a lift years ago who, on hearing "One More Heartache", said: Oh, that's a cover of that motown record by xxxxxxx. Who did originally record it, I've looked in passing at Motown compilations in stores, but never found it? - maybe it wasn't a motown record at all. Anyone know?

2. Who was Pigboy Crabshaw, and why did he need resurrecting?

Small things like this vex me more than the meaning of life, the universe etc.!!!