Guide to Light Fittings, Caps and Bases | Lightbulbs Direct
Screw Cap or Bayonet: Which Lightbulb Should I Buy? - Moonlight Design
Bayonet Cap Ceiling Lamp Bulb Holder T2 Cord Grip for use with Light Bulb Bayonet Light Pendant Un-Switched Light Fitting Holder (White) : Amazon.co.uk: Lighting