When I was collecting the vice it turned out it used to belong to the guys father and had spent the last 20 years sitting outside his workshop, hence the amout of rust.
Being a little bored this evening I decided to see how bad it really was, weapon of choice was the blue spanner and I thought I'd start with the pivot nut as it was the smallest part

Success! Although the threads look a bit suspect.
Spurred on by my success I decided to have a go at the main screw, this was really just a case of warming the nut/box, mostly at the end where the screw goes in as I assumed there would really only be rust at that end. Luckily I guessed right and she undid after just a little heat, just really enough to burn the dirt off the outside.
Interesting to see the thrust washer on this one actually fits into the hole in the leg.
Getting the pivot bolt out involved more heat, a big crowbar to work the jaws open and closed about 1/2 an inch, and a big copper mallet to knock the bolt back and forth till it finally gave up and popped out.
Getting the two halves of the hinge apart involved opening jaws and then placing a cold chisel in the gap in the hinge before closing the jaws again which would push the hinge apart a little, this was repeated till it came apart.
The pivot bolt looks hand made and is certainly usable again

Interestingly it appears tapered.
The jaws look to be in a bad state, will know more when they get cleaned up.

Still not too shabby for a fiver
