@frett I travel internationally independently and alone. I’ve travelled to the UK several times although not recently.
I choose hotels based on neighborhood, price and reviews. Book cheapest upgradeable air fare and use miles to upgrade to business class. Really nice to be able to stretch out on a long flight. Makes it special too, like an anniversary should be.
I use local transport to get to hotel from airport.
Are you familiar with TripAdvisor.com?
For guidebooks I like the Lonely Planet series but it depends on your style. Guidebooks are targeted to specific audiences. Rick Steves is much less adventurous than Lonely Planet but more adventurous than e.g. Frommers.
You will be jet lagged when you arrive. Typically I check into hotel then if I’m with someone who’s never been to London before, we take a city tour. London Transit used to run one where you could get on/off stops all for one ticket. I suggest just riding cuz you’ll be tired. You’ll go past places you’ll want to return to and places you don’t care to revisit but at least you’ll have gone past Buckingham Palace even if you don’t want to watch the changing of the guards. Then walk around a bit, have dinner and go to bed early.
Its a long drive from London to Scotland by car. Maybe 8 hrs.? I’ve only done it by overnight train. If you don’t mind spending 2 days of your 10 day trip just driving then go for it. You could spend 10 days just in Scotland. Ireland? Even longer to get there. Again, a place you could spend a week. Maybe that’s what you want this trip to be, the experience of travelling to/from Scotland and staying in B&B’s along the way.
I travel by public transit, ie buses, trains. You can get just about anywhere you want from London, just know that depending on where you’re headed will determine which station you leave from.