The problem is though that many children with continence issues won't have a medical diagnosis a lot the time they start reception! The Facebook UK children's continence support groups has 18,000 members, and there are a lot of parents posting there about desperately trying to get support for school aged children.
The NHS services either aren't there any more or have massive waiting lists. DC3 is now under a pediatric gastroenterologist aged 5, but we've had to pay privately. A year on from our NHS referral we are still waiting for an appointment date.
I contacted the HV aged 3 and a bit when potty training failed. They told me they didn't have capacity to help and to call the Eric charity helpline instead. I know friends with older DC with much less severe potty training problems who got HV help, but our local HV numbers have been heavily cut since. We did see the GP, but it's not something they have expertise in, and there are no longer any local Bowel and Bladder support groups. It was a year after we first saw the GP before they agreed to refer us for the first blood tests, and only at that point did the NHS consultant referral go in. DC3 had already started school before then.
We are fortunate enough to have private insurance, so had seen a private consultant to get the paperwork in place before DC3 started school. More disadvantaged children just won't have got far enough in the medical system to be able to prove medical need, so it will disproportionately disadvantage them.