Hi Marne
DD is now 3.4 and she has had a very vague 'global development delay' tag since 2.10, and epilepsy since 3.1. Having said that, she has had 'standard' 1:1 funding since 8 weeks after starting preschool. Her issues were picked up by them. Prior to starting we thought she was just a high maintenance child.
The Area Inclusion officer has been to see her 6 months on, last week, and feels that she has not made progress in terms of her needs, so she is applying for increased 1:1 funding to ensure that she keeps having full-time 1:1.
None of this is with a statement. The AIO will start the statementing process in December in time for reception start.
I don't think there would be any harm in applying for a statement now, but I don't think that you necessarily need one to get your DD 1:1 support.