School (Reception onwards) starts from the school year they turn 5. So September born children start as they turn 5, and July born children start age 4.
Lots of schools, but not all, have preschool and after school clubs - these are usually cheaper than nursery or childminder I think. But some schools don’t offer it and in some places they’re hugely oversubscribed.
There are “nurseries” attached to schools, and “preschools” which start from age 3 ish, I think, but they run to a school timetable and aren’t suitable for full time childcare.
Then as you say, there are full time private nurseries, nannies and childminders. These provide childcare for the full working day all year round. Nannies are as described above by others. Definitely the most expensive option.
In my experience, childminders are about the same price as nurseries. Childminders are fully qualified and registered. They look after a limited number of children in the childminders home. Typically you’d need to take your children there in the morning and pick them up in the evening. Some childminders also pick up and drop off older children at school, and do the pre and post school care with them. Dinner etc.
They often only do pick up and drop off at one school as it’s logistically hard to do otherwise.
We used a childminder for years and it’s great as we dropped both children there in the morning, and when our older one started going to school she’d take him, and have the younger one all day with others, then collect him and others at the end of the day. So we only had one place to pick up and collect from, and our children spent time together as well.
Childminders are more limited for spaces with younger children, so I would advise a lot of asking around and research if you are looking for spaces for two full time children in the age 1-3 category.
many childcare settings are very very booked up - people often put their names down many months in advance - so you should start finding out availability as early as possible.
www.childcare.co.uk/costs/
You can plug in postcodes here and get approx guide costs for your area. Where I am it’s £5.5 - £6 per hour for childminders and nurseries. Full time childcare costs were more than our mortgage by a long way for a few years.
good luck!