The smallest in-line junction box on the market - Electrical Contracting News (ECN)
10x IP44 Junction Box with Push on Lid and 15A 5 Way Strip Connector for Electrical Wiring and Lighting - Indoor or Outdoor - 65mm : Amazon.co.uk: DIY & Tools
Click Essentials WA072 30 amp 3 terminal heavy duty junction box white - Light Switches from Ocean Lighting UK
Explanation of different domestric electric lighting wirings
Extending a lighting circuit | DIY Tips, Projects & Advice UK | lets-do-diy.com | Basic electrical wiring, Electrical plug wiring, Home electrical wiring
Axiom Lighting Junction Box 20A 4T Small White | Toolstation
WAGOBOX Light Junction Box 95 x 39 x 29mm | Toolstation