I will start with my "quick summary" and then post a more lengthy version with commentary.
Day 1
Oregon to Heathrow direct
Tube (Piccadilly) to apartment
Dinner at Ivy
PM walk: Westminster, Southbank, Trafalgar Square
Day 2
Tower of London (Crown jewels, Yeoman tour, white tower)
Tower bridge view
Bystander Kitchen for lunch
Walk to see: St Dunstan of the East Church Garden, Leadenhall , Sky Garden (outside), Gherkin building, The Monument
Sunday Roast at Marquis of Westminster for dinner
Day 3
Westminster Abbey
Abbey Road crossing and Abbey Road studio shop
London waterbus to Camden Market
Camden market for food and shopping
Kew Garden Christmas lights
Day 4
Crumpets restaurant for breakfast
Tate Modern (free exhibits)
London Walks Jewish History tour
Spitalfields Market
Dishoom for dinner with best friend from high school
Day 5
Warner Brothers Harry Potter Studio
Marugame Udon for dinner
Day 6
Train to Bath
Roman Baths
Sally Lunns for lunch
House of Frankenstein
Mr B's Emporium (book store)
Royal Crescent
Bath Abbey (just me)
Bill's restaurant for dinner
Fun train ride home
Day 7
Crumpets for breakfast
Buckingham Palace and the Green Park
British Museum
Novelty Automation
Covent Garden
Balthazar for dinner
Stranger Things First Shadow play
Day 8
Royal Quarter for breakfast
Infinity Mirror rooms
Borough Market
Southwark Cathedral
Globe theater tour
Tas Pide for lunch
Oxford and Regent street for lights
Papa Dum for dinner
Day 9
Royal Quarter for breakfast
Uber to airport
Easy airport check-in and flight home