It's a mess here in the USA too.
I've been a railfan for over 40 years, traveled all over the USA, and Canada, spent LOTS of time with railroad crews (including track workers), and I can't recall that I've EVER heard a railroad employee call a "switch" a "turnout".
The "turnout" term seems to have arisen with Model railroader magazine (perhaps in the 1960's ?) to eliminate the confusion in MODEL railroad applications caused by the term 'switch' having two meanings (electrical and track).
In USA terms, a "Switch" is a branching from one track to two (or occasionally more). While there are several types of "switch", the most common has the usual "Points" (the moving portion), "Frog" (where the rails cross), and "Wing Rails", "Guard Rails" (usually, not always), "Tie bars", and a bunch of other parts.
As started this thread, the British use the term "Points" to describe the whole device. But, as someone else observed, not all "switches" even have "points" (stub switches).
This is lot like the thread on "what's a bogie/truck/etc.?" a few months back.
Dan Mitchell ============