How do I connect the wires inside a conduit junction box?
You piqued my interest and I have a screwdriver.

Here's how a professional electrician in the UK made joins in wiring in my office building constructed 2001 (so as per regulations at that date).

Not all junctions contain joins. Some do.




So yes, use terminal strips (blocks) like these - all DIY stores have them, some ironmongers and larger supermarkets too. Make sure they are rated for the current they'll carry.

As you know, Part P of current UK building regulations apply to DIY work on wiring connected to mains supply.