Redskyatnight, our Reception sounded very similar to yours. Mostly free play in the various areas (construction, home, art etc. etc.), with short sessions of tuition, using whiteboards for letters and sounds. The children didn't have a set place to sit at, but rather worked where they liked, a lot sat on the floor.
My dd found this hard, she liked sitting down and concentrating on stuff and I think found the 'free for all' feel about the class very disturbing. The tales I heard about what went on.....so and so putting stuff in the toilet, someone else cutting the hair off the doll in the homecorner, 4 year olds being sent to the headmistress (I kid you not), this was a class with a NQT and a TA. It sounded chaotic and I didn't say anything about it, thinking that my dd must be wrong.
When we decided to take our dd out of the school at the start of Yr2, the head told me that they stuck rigidly to the EYFS. She also said that in reality it wasn't right for that group, they needed more structure and 'bums on seats', she admitted they had run riot and that it was the fact that there was a NQT and also she herself didn't feel she could intervene at the time.
I am sure that this focus on play is great for some of the younger ones, but the older children, who may be nearly a year older than the youngest, probably don't need this. Good on the schools that recognise this and split the children, or vary the work, but I fear that a lot of the time with 30 in a class, this isn't always easy or practical.
I do wonder now, whether it is wise to teach the basics at home - are you setting them up for being bored when they start them again at school? If I was doing it again, I question if I would do any numbers or letters before starting, but that is probably another thread!