Don’t ever recall seeing them go through Lewisham at any point in time!
I do remember some Family Friends telling me about a time were coming back from Paris on the Eurostar back in the late 1990s, due to a problem with the lines, the train terminated at Ashford International, and everyone got put on an another train to London via an alternative route.
“We were on the Eurostar, in lovely comfort of Standard Premier, sat at Ashford International for ages, waited and waited. Then we were told to get off and that another train was being organised for us...an old Dirty, Dilapidated and Draughty Slam Door Train turned up, which rattled along through the Countryside...thought we were coming off the rails at some point!”
Think the train took them to London Victoria, where anyone who specifically needed to go to Waterloo International, could get a Taxi, but they didn’t as Victoria suited them to get back to where they needed to be.
Whether it was an actual additional train, or they were simply told to get on an ordinary service train into London, I don’t know!