its a long answer but basically…
No, if you state your frame is for racing only, otherwise yes if you want to call it a mountain bike. expect lots of mountain "style" bikes in halfords.
When did they / do they come into force
it comes into force end of this year but if you had an old design you are alowed a grace period where you can sell off old stock you had already ordered
What sort of consultation was there in initiating these regulations
very little, some industry people say its a good idea but poorly executed
so why do the new regs ask for so much?
its a fatigue test, it was seen that the amount was an accepted minimum.
Will we see all bikes having to conform
yes, unless its for racing
Bikes will get stronger but only predominantly in the areas the CEN requires