Inspiration to choose a theme for your walk:
https://www.walks.com/london-virtual-tours/
https://www.visitlondon.com/things-to-do/place/115945-london-walks
https://www.getyourguide.nl/discovery/s?q=london&searchSource=2&utm_force=0
https://www.london-walking-tours.co.uk/
https://www.londonguidedwalks.co.uk/virtual-tours.php
https://www.youtube.com/user/Joolzybaby
https://www.visitlondon.com/things-to-do/london-areas (areas)
https://bitaboutbritain.com/periods-in-history/ (historic time period)