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@pip
First you need to see what width of cog it is: 3/32" or 1/8" (ie narrow road chain or wider track chain).
Thats it really. Hub-jub.co.uk, Condor, Brick Lane, Brixton Cycles should all be able to help you out from there.
Obviously as we're dealing with bike parts, nothings that easy. There are actually multiple threading standards for hubs/cogs. Typically you see either ISO or English threading
I.S.O. 1.375" x 24 tpi 34.92 x 1.048 mm
English 1.370" x 24 tpi 34.80 x 1.058 mm
But you can also see:
French 34.7 x 1 mm 1.366" x 25.4 tpi
Italian 35 mm x 24 tpi 1.378" x 1.058 mm
ISO, English and Italian are all semi-interchangeable but you're best sticking to one threading standard if you can.
Maillards may be a little weird though, they're french made (?) but I think they have ISO threading (as they tried to compete with Campy).
The only other weird thing you see is the Miche cog carrier systems. Pretty obvious to spot.