Spiral Pre Torch, David/Giants Mecca 74/75, Buckinghams No Idea, Keith Wigan 73/74
Mitch Ryder's stuff was also very early (Pre Torch), although whether it's "sunshine pop" I dont know.
In fact most things that got a 60's UK release would probably have been known prior to Wigan, obviously there will be a few that sneaked through, or lacked the quality, but were played later, Marion Ryan for a start.