The upper bulb is a Standard UK bayonet fitting type. Also available in France. There are two contacts, but the outer bayonet cap is not part of the circuit; the female metal bayonet is not usually grounded as it has a bakelite sheath, ( all metal bulb holders excepted). 'Screw' caps are also used extensively in Europe for 'fancy' bulbs.
The lower right packaged bulb is a low energy unit, essentially a fluorescent fitting with integral starter.
Alan
