To wear my roots on my sleeve I have to say -
JJ Burnell - Stranglers (is he counted as underrated?)
Paul Gray - Hot Rods, Damned, UFO et al
Bruce Foxton - Jam
William Mysterious - Rezillos
Jah Wobble - PiL
+1 on Gary Tibbs too
Loads more really that my crappy old memory fails me on. The top four moulded my 'style' for sure
Oh.. just broke my basschat virginity! yay!