Bottle Lampholder BC with Side Entry - Quality Products Lamps and Lights
British General Straight Batten Lamp Holder BC 3" - Screwfix
Bayonet B22 Standard Switch Light Lamp Holder, B22 BC Socket Lamp Holder Base with Cord Grip, Bayonet Cap Fitting for Pendant Lamp, Ceiling Lamp (2-Pack, White). : Amazon.co.uk: Lighting