Halfords do a set of ratcheting C-Spanners, invaluable for starter motors and not too expensive, cant remember if they are 6 or 12 point though.
Britool used to do a stepless ratchet that got a grip no matter how small the movement. Lost my one and haven't seen them in a few years. I replaced it with a new type 1/2" ratchet from Facom that you can spin the handle so its effectively a zero movement ratchet, it allows you to take up all the ratchet slack to get it moving using it conventionally, bit pricey though. HTH