Dino, I can't answer most of your questions as my daughter won't go into Reception until September BUT, our catchment school prospectus focuses on getting reception children to be able to sit & listen to instructions, put their own jumpers on and change into plimsols for PE and only then will start doing 'learning' type things.
I accept these are crucial things for any child to be able to do at some stage in their lives and cetainly do not have a problem with children learning reading /writing etc much later than 4/5.
But my dd can do all of these things, read, write, is a completely social animal and I worry that our local school will not be able to cater for her. I learned to read early and was only happy when emerged in a book whereas she is a total livewire & I fear she may be disruptive if bored.
I've not tried to 'hot-house' her, quite the opposite but she is determined to learn at the moment & is a sponge. She's also very physically active and needs a strong focus for her energy.
As I said earlier, dh and I are left wing to our cores but are struggling.