For France, the going rate varies with location [ paysage v. grande ville, just like everywhere else], but 50 euros per hour would be about the rate here in the sticks. That will include at least 9 Euro 50c per hour social-security payments for an employee or self-employed electrician,[BTW, even when you have no work!! ] and 19.6% tva ( or 5% in certain circs ), say E32.50 net = 20 quid in your pocket before income tax. Cost of living is generally lower than the UK, particularly housing, local taxes, wine, tobacco, food, petrol, diesel, clothes etc..
As to qualifications here, the local Chambre des Metiers
, [ similar to the UK mediaeval Craft Guilds ], would judge if your UK qualifications were suitable to work in the trade, ie RELEVANT City + Guilds or ONC/HNC, and/or
a RELEVANT apprenticeship, plus a short UK/Fr changeover course if needed, [free and you pick up c.60 euros a week expenses]. If not you can't operate, full stop.
And you need mandatory Insurance to cover yourself if your workmanship is found faulty.
Plus everything you do must be guaranteed for 10 years.
There are no Inspectors and no Building Control Officers. Just your pride in your metier and your skills, which the powers-that-be rely on for good workmanship. Create enough cock-ups and the Chambre
, ie your fellow craftsmen, can and will strike you off!