Thanks jyl, I did make a start taking the wheel apart after my first post, unfortunately I didn't see the tip from Carbonfiberboy about taping the spokes together untill afterwards, but I think that would have really helped me.

I got all the spokes removed with just a screwdriver but ended up stuck at that point. It's a rear wheel and I found that I could not get the spokes out of the flanges because the bit for the chain to go round was in the way. I tried to get this off but it didn't seem to want to budge. I think I may need to read up on this and get some more tools. I'll have a look at the website you recommended.

Thanks