Litever Power Splitter, 2 Way, 1 Female Jack to 2 Male Plugs, 5.5mm x 2.1mm, 1:2, Y Adaptor Copper Cable, for CCTV Camera & LED Strip Lighting Power Supply Connector : Amazon.co.uk:
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RUNCCI-YUN 20m 22WAG 2 Pin LED Strip Extension Cable 12V Cord LED Wire for SMD 3528 2835 5050 5630 LED Tape LED String Light or Other DC 5V-24V Device+2 Way T connectors
Taking the Feed (Supply) to the Switch & 2 Way and Intermediate Switching of a Lighting Circuit - YouTube
Change-over domestic electric lighting circuit (UK)