Do you mean the Military Army Surplus ones Steve ?
If so i have had a few pairs over the years if you wear a proper pair of socks then i found them warm enough but no more warmer than my wellies to be honest, on the waterproof side of things i found them excellent they never leaked or let in water even when they was on their last legs. im a size 9 but found them on the snug side so went up to a 10 which i found fine they also do them in half sizes and different width sizes which is handy.
There used to be a place in Melton Woodbridge that used to stock them dont know if they are still there as i have not been there for a while, theres also an Army surplus place in Sudbury that hold quite a few pairs in stock in all sizes.
The place i use now is the Wholesaler in Essex who supplies the above shops its a bit far from you but they always have plenty of stock in all sizes and will do them at trade price.
Obviously if you didnt mean the above boots please disregard all of the above...!
Cheers