All,
Thanks very much for the replies.
I will remove the spring first. It is looking rusty and dirty but will probably clean up ok. I'm not sure if the shaft is rotating in the frame but I will clean it up and grease it well on re-assembly.
I couldn't get the paddock stand in place as the exhaust silencer is in the way. I removed the two nuts and bolts holding it to the frame. One of the clamp bolts came out and the other is somehow an anti theft shear bolt with nothing to get a spanner or socket on. I thought I would loosen it by turning the threaded end with mole grips only to find my four sets of various mole grips have disappeared!

I then used my Dremel type Black & Decker multi tool to grind the head off the shear bolt. All was going well, then there was a loud pop from the tool and the garage lights went out. The garage supply breaker in the house had tripped and the tool is now no more. I will buy another one and complete the job at the weekend.
There is lots more to do on the bike so I will, no doubt, be after more adviice in the future.
Kind regards,
Mike.