I think this thread has a disproportionate amount of SEN kids.
I grew up in the 70s where we had public service announcements about the need to learn to swim, so that has shaped my aspirations for children.
Saying that, as #4 child, I didn't get the same amount of parental energy and my swimming lessons were at school. I did learn to swim in that environment and got my Scottish Swimmer Award, etc. I am not an elegant swimmer - breast stroke and don't get my hair wet.
DH is a good swimmer - can do lengths and lengths without getting tired. He was a camp counsellor as a teenager and got his bronze medallion.
We have not been great with our children. The eldest did toddler lessons, and then a bit at young school age. We moved to the USA where we were pool club members. During these four years, the children had swimming lessons every day for eight weeks each summer. The eldest two became pretty good swimmers.
When we returned to the UK, we didn't do much swimming, until just before we were due to do an activity holiday in the USA, so we enrolled our girls in council lessons. They then did intensive lessons for two weeks in the USA. They all feel they can swim, although they don't visit the pool much. DD5 lives by the seaside and swims in the sea.
I will put my hands up and say that a lot of middle-class parents don't do swimming lessons because they CBA or can't get organised or simply don't prioritise.
I am now a foster carer and have two children who arrived with no experience of swimming. I take the younger one to lessons once a week (and wonder how I managed to get into this situation) and she loves it. She went from Level 1 to Level 2 within 3 weeks. The elder one is 15, so we are waiting for his birthday so he can join adult classes.
Unless you have SEN children, or are on the breadline, swimming lessons are a case of how you make priorities.