After a LOT of running around getting tools together (that's what you get for lending them to friends), managed to change one of the shocks today. Not the most impressive result but it is my first time, the other one should be quicker tomorrow.
In case anyone is interested, I managed to get the nut for the top cap off using the following household objects:
7mm allen key
13/16 spark plug socket
mole grips
the lever from my trolley jack

Probably not news to some of you but I was impressed that it worked!