EDIT: Askari do a good range, but you are liable to be stung for import duty in the UK.
EDIT: Also look at the range from I agree about Artizan. Plenty of photos on their website and easiser to get hold of than Askari if you are based in UK/Europe (as I see the General is).
You could also supplement the Artizan figures with the Woodbine WW1 French (available from Gripping Beast) - in particular the Tirraileurs Seneglese, which are not covered by Artizan's range.
I'm considering extending my Frenchies using figures from both of these ranges.