Morning Glory, Leftover Crack, Star ******* Hipsters, Operation Ivy, all great, all punk.
Operation Ivy are AWESOME
but I would also recomend Citizen Fish
Ehh...I wasn't very impressed with their split with Leftover Crack. If I want british punk I'll listen to the adicts, Crass, or flux of pink indians.
Last time I checked, ska has punk in it automatically, without it, it's just fast reggae. The planets, operation ivy, fishbone, straighter than pete, the bosstones, Reel Big Fish, No Doubt, Sublime, skankin pickle, Ian dury and the blockheads are the names, along with the ones you mentioned that I can recall from my adolescence.
Ska pre-dates reggae, rocksteady, and punk.