I don't have hot food delivered ('cos I'm on my own and my tiny orders wouldn't normally qualify for free delivery).
I don't have a milkman. (I've not even seen a milkman around our town for at least 20 years).
I used to tip the bin men but I'm often out (or asleep) when they call, so it's not easy to do so now.
I give the staff at the launderette I use (for 'service washes') several tins of Roses choccies, to share out amongst them, each Christmas.
If a restaurant bill (in a 'proper' restaurant, not a pub) came to £40, I'd leave at least a fiver as a tip but, for a really good meal, a tenner would be more likely.
Around 20 years ago, I was on my own on Christmas Day and decided to try out an Indian-East African fusion restaurant in south London that Time Out said would be open. I had one of the dearer starters, a higher-priced main course, a dessert and two glasses of lassi. The food was all freshly-prepared to order and was possibly the best meal I've ever had. The company was delightful too, as everybody was talking to complete strangers on other tables in the restaurant. On a day when my local pub would have charged me £35 for a bog-standard turkey lunch, my bill came to £10.80 but the restaurant owner then rounded that down to a tenner! I happily paid that tenner - and left a twenty quid tip on top!