I got the rear struts apart yesterday. They were not as bad as I thought. I held the nut in a vice, applied heat and hit the steering arm with a hammer till it came loose.
People have suggested powder coating all the suspension components while they are off the car. I have been reluctant to do this as I am trying to not restore the car but maintain its originality. However, looking at the surface rust on the rear struts I feel I must at least POR15 the springs, rear struts and top hats just to preserve them.
With that in mind I degreased them with Marine Clean yesterday after removing loose rust with a wire brush.
Today, if I get chance, I will prep them and paint them with POR15 black.