I've discovered a collection in a similar vein, but possibly better than Nuggets.
Its called 'That Driving Beat'. Despite the gay name, its generally more consistent than Nuggets. I'm comparing Volume 1 of each here.
All Brit Freakbeat from 63-67. Not a bad track on it.
Good compilations such as this are REALLY tough to find, but I recommend it. 31 tracks on each volume, and £5 for each.