Crosspost.
pac, I would think you can plait almost any dough that's not too liquid, but it's basically Linda Collister's challah.
14 oz flour
7g sachet of yeast
1/2 tsp salt
2 medium eggs
50ml oil/slightly less melted butter, as you like
100ml tepid water
2 tbsp malt extract or honey
I like poppy seed and an egg glaze on top.
Mix the dry ingredients, then mix in the egg, fat and honey. Obviously, add more flour if it looks as if it needs it. If it's too dry (never happens), you'd add more tepid water ... obviously! 
Let it rise for about an hour. I quite often give it a head start with a hot bowl TBH, because I am lazy. If you're sure you won't drop the bowl in water, you run a few inches of warm water into the sink and pop the bowl with the bread in it in there.
Once it's risen, divide into four (or six, if you feel confident). Roll each piece into a strand about 30 cm long. Pinch all four together firmly at one end.
Pull the strand furthest away from you over the other three, then tuck it back away from you under the last one it's just gone over.
Pull the strand that's now nearest to you over the three further away, then tuck it back under the one it's just gone over.
Keep repeating. Pinch ends together. Let it rise again.
(This may also be really obvious but I didn't know!).
Takes about 40-50 minutes at 190.