As nobody has replied, I'll put in my opinions having attended the open day this morning.
We watched band practice, which starts the mornings for some of the kids, and though they are probably not ready for Carnegie Hall just yet, their skills were impressive for a group of primary school children. We also met the Year 6 children, who seemed a happy and friendly group, and we asked them questions and they gave us frank and unfiltered answers.
We then walked around the facilities. Like any school in the city, yes it does suffer from lack of outdoor space. I think they have done a good job with the space they do have. I wasn't sure how the indoor playground would work, but then I saw children playing on it and I can see that it's probably totally fine for letting off a bit of steam for 10-15 minutes at a time, especially given they also go to the park every day.
The downstairs classrooms have clearly had every effort put into them to make them feel like they are not in a basement, and actually I rather liked their open-plan feel. Yes it is small and yes they will have trouble in the future if they don't manage to find extra space. Right now it seems fine.
In terms of academic structure, I feel that for tiny kids, Dallington probably has the edge on Lyceum, with its topic-based exploratory work, but Lyceum offers a more formalised environment which for my children would be more suitable especially as they get older (your own kids may be different).
Their plans to put an extension on the top of the building have come to nothing, but they are looking to acquire another building nearby for the early years/reception children, which would be ideal really.
I was hugely impressed with the head, Vanessa Bingham. She clearly has a strong focus on providing value for money when it comes to education. I got the feeling that, like all of us, she also does not think it's ideal that schools are sometimes managed by for-profit organisations, (but she pointed out the benefits of centralising some of the admin/HR/etc and I don't disagree). Her own personal approach to providing a top-notch education appeared faultless.
I went in with some trepidation, but I came away thinking this is really one of the better city schools I've seen, Minerva notwithstanding. I am sure the last couple of years of huge upheaval have been upsetting for existing parents and kids--though the Year 6 kids we spoke to today, when we asked what had changed in the last year and a half, only talked about positive things they had seen: better use of existing space, more clubs tailored to their interests, teachers offering new topics like philosophy, and so on. They genuinely didn't seem bothered about any of the other big changes that I'm sure all of the parents in the room today knew about.
Just my two cents for anyone else who may be looking for more recent information like I was.