<snip> There is something that fits the bill in John Lewis clearance, however nothing says whether it is double insulated.
Pound to a penny it will be. What you are referring to is what are known as Class II fittings, this being represented by the double square symbol. Class II means that they have a double layer of insulation to prevent a user coming into contact with any potentially conductive part of the fitting. To preserve this double insulation, an earth wire must NOT be connected to the fitting. Plenty of information in French or English on Tinternet (n.b. it's 'Class II' NOT 'Class 2').
I can't think of any mainstream manufacturer who would make anything but Class II fittings today. But why not just ask John Lewis?
For a pull cord light here in France, try searching under 'applique', 'cordon' or 'corde', 'traction' ou 'à tirer'. However, they appear not to be very common (are they anywhere?) and, for reasons not worth going into, are mostly sold for bathrooms. See here, for example:http://www.france-luminaires.com/23589- ... oule.html#http://www.france-luminaires.com/20618- ... hrome.html