At what age does a child start primary school (Reception class..?)

[nopainnogain]

We live abroad and I just wanted to check when normal full time school starts in England. Can anyway let me know how it works please?

Start academic year when turning 5 between September 1st and August 31st, so some could be almost 5 , some just 4 . Later b'days sometime start part time , in January or even at Easter.

Thanks Lizs!