Trick or treating 'rules'

[Skyisbluetoday]

Are there any to follow? I have never gone trick or treating before with my kids (3 and 6). We used to live in an area where this really wasn't a thing, but have now moved and it's possible. I don't know if there is an etiquette I need to know about? It will only be the two of then (and me). I assume it would be OK to knock on people's door if they have halloween decorations out, and avoid those that don't. Or do people not do a door to door halloween now? Is it just shops (don't want to do that)? What time would you go out with them given their ages? Thanks!

Shops Definitely not a thing in the U.K.! Weather is rubbish today in London so not even sure if I’m still going, do people take their kids in the rain 😣

I found back in France 20+ yrs ago when on a french exchange that they did shops, was quite weird being from the uk and just doing houses, there you could pop into the opticians, banks etc and they’d give out sweets!