cml:
i thought White Spirit was exactly that - a spirit (ie alcohol). If so, i don't think you can use it.
I use Tamiya Enamel Thinner - just because it's more readily available here than Humbrol thinner. Works pretty well for me.
Chris,
White Spirits (Aus/UK) is analagous to Mineral Spirits (US) and is essentially the same stuff as Humbrol (enamel) thinners. It's not an alcohol.
Incidentally, Tamiya Enamel thinner (blue cap) is much the same as mineral/white spirit. I have used generic white spirits with Tamiya enamel without any issues - You can buy a litre of Diggers branded white spirits at Bunnings for about $5.00 - compared to about $14.00/250ml of the Tamiya stuff.