Cheers Clive.

Beads came off e-bay:

3mm Porcelain Media 3Kg Vibratory Rotary Tumbler / Polishing Finishing | eBay

Not cheap, but they do the trick - if you're going to buy some give me a shout - I want to get some plastic media for de-burring, maybe we can combine p&p..?

Wal.