Nigel,
I don't know where you are in France, but sharpening outfits are becoming more and more rare. Having said that, i'd never try to do it myself. The outfit I use have huge, very sophisticated machines and do a fantastic job - a 60 tooth triple chip blade would be almost impossible to do without a cnc machine imho. As an aside, HM diffusion now have a shop near me in Rouen. Seems strange opening bricks and mortar stores for what was mainly a catalogue firm, but Axminster in the UK have done the same so what do I know? What i do know is tha HM are consistently VERY expensive - but then tools here are generally a rip off. You can always find what HM have on offer for less - even when they have a promo. It's worth buying in the UK at the moment. If you are VAT registered many will ship to France ex Vat.
Regards,
Richard