I actually took mine to work, mainly because I don't have a vice at home,and also because we have a fully equiped mechanical workshop
the camshaft was wrapped in cardboard and a pair of "soft jaws" in the vice, then used an adjustable two-pronged key wrench (kind of like the ones used for taking grinding discs off a hand held grinder) and a hide hammer to "persuade" it to unscrew. I did try a strap wrench first, but it just kept slipping, didn't want to use stillies or water pump pliers or anything like that just so I didn't damage anything, and I didn't want to buy the proper tool because I've already spen a few quid on cam locks, TDC tool and other such things.
As for putting it back together, I didn't have any fishing wire, but tries some fine gauge steel wire, which just bent, so I used some steel wire of an old roller garage door opener and it worked a treat! Just put the gears back onto the spline, clamped them together (it was too much of a pain to just hold them because of the spring) and thread the wire through the centre of the spline, just enough to stop the gears from sliding off, put the washers into the variator body, and lowered the whole thing in. Once assembled, the circlip was put on and the wire pulled out...........dead easy.
Or at least it will be the next time I do it!
And I really appreciate everyones help, because even with a workshop full of mechanical tradesmen (including an engineering uni graduate) it wasn't as straight forward to figure out as it should of been.
I honestly don't understand why Alfa's don't have Haynes workshop manuals?!