Does anyone know where I can get hold of 1mm bolts (M1) with long shafts (ie longer than 1cm). I've found a lot of websites offering 1mm bolts but all are very short. I'm also looking for 1mm nuts and 1mm wing nuts.

Try:

http://www.microfasteners.com

I've ordered several nuts and bolt lots from them. You can call their 1-800 number -- tell them what you're looking for and they'll help out -- very nice people, very reasonable prices, and prompt shipment.

Cheers...