I just posted this on the other post asking about Bumblebee vs. Mouse House, but reposting just in case:
It's now been 3 years since my daughter has gone to Noah's Ark, so the info might be a bit out of date (back then, they only let them in at 2.5). However, two of my good friends have their kids there now - one is about to finish after two years there, and the other one started in January as a 2 year old. Both of them love it.
It's a relatively small nursery, tables are about 8 in size. For each of the tables, they have one teacher that they stay with for the whole year, and I think there might be a dedicated assistant for the younger one. They do a variety of activities, teaching, and there is a big focus on the right behaviour. They have a tiny outside space that they were using, I do not know if they now started going to the common. The nursery itself is bright and well equipped, on account on being on the first floor.
Please note that this is a "Christian" nursery and associated with Dolphin School (you might find more info if you go to the Dolphin School website). However, we are atheist and did not find it too much (we were a bit worried) - the kids are taught about the Bible etc, but not any indoctrinating way (and there were certainly families of many faiths attending).
There is a real sense of community around the nursery and I found the parents and the teaching staff, as well as the management, really lovely.
I honestly think you can't go wrong with Noah's Ark!
I know nothing about Bumble Bee nursery, but I see that it's in the same group of nurseries as Mouse House. So it's the same principal.