I did 3 strings of UK sits in 2022, 15 sits in all. You’ve got most of the tips I’d offer. Add one more - there are a few houses that have names, not numbers. The what3words app solves that problem as it assigns a 3 word phrase to every 10 sq m place. Then you can put the words into google or apple maps.
And I’d encourage you to get a smart phone. Map software is so useful for getting around, bus schedules, ride shares, even paying for transit.
Some other useful apps -
Atlas Obscura - cloud sourced for finding unusual tourist attractions (all over the world, but lots in the UK).
Eatwith (also a www site) for food experiences with locals - lots of pop 1 night food experiences in London. A good meal and for a solo traveler a way to meet other travelers.
trainline - comprehensive train schedules and tickets throughout the UK. There is a service charge that you might not pay if you use each train op’s own site, but trainline even breaks multi-train journeys and finds sometime cheaper tickets by splitting the ticket. The ticket shows up on your phone. And if you are a senior, buy a senior card and load it to the trainline app and it saves your senior card and searches for senior prices.
I use US T-mobile for my cell phone and intl 4G data and text messages are inclulded so don’t need to buy sim card. But I think that is a feature of US plans only.