I don't have a good understanding of what sambo is but I am frequently told it is "kind of like judo"
Judo with wrestling and leglocks but no chokes. Its like old school judo with unusual grips and entries really, theres not much real sambo around in the uk.
There is a very strong presence in the NW - Matt Clempner, Steve Crutchley and Mahender Patel are all in that area