I think people are being hard on the police. When thigs go wrong, when an elderly couple are found ill or collapse for lack of nourishment or are found dead at home, the first thing that is done is that Social Services are blamed for not picking the problem up. Then ift he police or any other public service has had any contact with that person who is blamed.
So, nowadays, any official person having contact with the public is trained to look out for any sign that anyone who could be vulnerable, older people, mothers with children, etc etc and report it to the relevant authority.
Now you say We are not tidy people, my husband and I! In fact some people might consider our home somewhat shambolic!
I am afraid to say this, please do not take it amiss, but someone coming into a home that is in the householder's own words shambolic may well see it as a house looking like a tip and interprete this as a house where the elderly occupiers - and your DH is 90 - are failing to cope and, as his job requires reported it on.
I used to work with elderly people, visiting them at home, and, yes, I used to go to some houses that looked as if a tornado had been round them and it is very difficult to see the difference between this being a sign that the occupier is failing and needs support and that the occupier is just happy living in chaaos. And to be honest, nine times out of ten, if a house looked shambolic, it was a sign of someone uable to cope.
So, Ok, in this case you and your DH are the one in ten, and somebody has to be that person, but in the other nine times the polic office has reported a household to social services, they have actually needed that help and his report may have saved that person from harm.