Looking at this myself, but my child is already in Reception and it has been very tricky. We are in St Neots, Cambridgeshire. Schools seem to vary a lot so my advice would be to visit a number of schools, speak to them about your concerns, visit at both open evenings and during the daytime when the children are there and go with your gut feeling. Remember a schools culture is very important and this is often built top down.
Also it is worth noting, many people aren't aware of this, that there are lots of options.
Firstly, children don't have to start school at all (Home Ed is completely legal and you don't have to register them or anything).
Secondly if you choose to send your child to school then pay attention to the CSA dates (compulsory school age). Many people say that CSA is the term after the turn 5 years old but this cna be misleading. The prescirbed dates are 31st December, 31st March and 31st August (so children born 1st April onwards are summer born and not CSA until Year 1). Check out School Admissions Code, point 2.16 for more information.
You can defer a school place without losing it until CSA (or Summer term if your child is summer born).
You can also send your child to school on a part time basis before they are CSA. You can't be fined for taking them out of school before they are CSA either, so holidays and days off are fine (but you will have to inform the school formally of planned absences the same as all parents - they will just be authorised automatically). This may be frowned upon, and schools often discourage these things or tell you you can't do it but this isn't correct.
There are lots of groups online that can help with advice and legalities too if you're interested.
Facebook: Flexible School Admissions for Summer Borns is one group, and there are Home Ed groups and FlexiSchooling groups that can help too.
You can also check out Personal Education Now org website too. They have an info document on their FB pinned post for pt schooling for under 5's that is helpful.
Hope you find a wonderful place for your little one. There are great schools around, and not one size fits all. Go with your instincts, you know your child best. Not all state schools are the same, visit and ask questions.