What's the correct way to join lots of lighting cables together?

Hi Nick, Couple of things here. Most people think, aha the lights have come on I did it right. All fatalities and fires caused by faulty wiring are a result of there being electricity to hand but without adequate safety employed during install or the inadequate/incorrect testing of the wiring. So, first thing, apart from seeing if your work has allowed electricity to flow, how else have you tested your work and more importantly, tested the current underlying safety of your electrical installation. Secondly, how do you know that you have correctly chosen the switchgear? Quoting what is says on the box does not mean anything. How is the CU supplied, have you installed it in the right place? Lastly, the work you are doing is ILLEGAL without local building control notification. I doubt you will be caught, but there is a £5,000 fine if you are. Most people are caught after a fire or injury (see the two points above). Connecting wires is easy. Testing is the only way you will know that your work is safe. You want to work illegally and then trust in God with your and your families safety, then go right ahead.

Use 6 way maintenance free connectors such as Wago connectors by Hellerman Tyton

Hi , best way to join and make look better would be to get a small pvc moulded enclose and take the cables into it using stuffing glands (mayb 2/3 cables per gland) and join inside box either with crimps or wago connections (push fit joins) . Hope this helps

Hope you notified building control for the new con unit. Just saying.