So OP, do you feel pressured by your dh into not "being British" (which is quite a red herring, I would say; many Germans avoid letting their children walk alone at age 5, for instance) or do you actually want to leave them at home and feel perfectly fine with it? Or have the more extreme posters on this thread even made you agree with him that Brits can be overly protective, so that they have encouraged you not to "be British"?
Interesting question. I suppose yes, I do feel a bit pressured into not appearing too British. I know by the end of this year there was only one mother who accompanied her KG child to school and that is because the child has a physical disability and cannot walk without help. However, she has to wait five minutes after her two older kids have already left in case anyone thinks she's accompanying them 🤣 But clearly I have been converted (desensitised?) to some extent as some of the comments left me 
No, as I've previously said, I don't feel comfortable leaving them alone in the evening. Hence the post, wondering if, as the neighbour would know and be home, it was in fact ok.
When my (also German) son had just turned 7, he arrived at school a minute or two late, having walked there with his friend. The first lesson was PE, and his teacher had already locked the door to the sports hall, so he couldn't get in. He wandered around a bit alone then came back home - I work from home so was there to greet him. Nobody phoned to ask where he was, as nobody noticed
I'm 100% certain this wouldn't happen at our school. They have a policy of calling 5 minutes after the bell if a child hasn't appeared. The only time a child went missing was when the mum called to say they were running late and then the child decided to walk around the school and home again. They notified the parents about 20 minutes later and child was found playing with a neighbours pre-KG child in the garden.
Our block of flats is like most around here, there are 9 flats in our block. Everyone says hello to each other and chats to the kids when they see them, help moving stuff, lifting stuff, parcels and post on holidays etc. We've been here 5 years and the newest occupant has been 4 years.