Im a regular on VS19 too. I used to (oh no Im turning into a Used To... see my TR's for an explanation) wait for Concorde to take off in the upstairs part of the old clubhouse and use that to time walking to the plane.
Its hard to do that now so heres my LHR Itinerary.All steps optional and optionally with a glass of bubbly at every stage

Haircut. Always. Pre booking seems essential these days.
Freshen up.
Shoe Clean.
Breakfast, hold the brown sauce.
Read the paper
Browse the web.
Grab a stack of papers for the plane (not required if you are in Upper)
Hop upstairs and step outside to see the bustle of the airport. I never tire of it although upstairs and outside sucks compared to the old conservatory the rest of the Clubhouse it better than the old one now its fully open.
Downstairs for a last drink before boarding.
Wait for them to call the flight - unless you like to queue.