I decided to clean the magneto chain, the valves and valve springs etc. I washed and brushed them in paraffin and then lightly oiled them before putting them in a container for safe keeping until I need them. The valve springs were quite corroded and pitted, so I have decided to scrap them. I can get a brand new pair for £14 and will order them when I am ready to reassemble the rocker shaft and valves.
I have also wire brushed the fuel tank straps and given them a coat of red oxide.