It looks like we saw this in 2000 at the Comedy Theater in London although I don't remember being in London in 2000. So we may have seen it later or earlier.
Or perhaps I am forgetting a trip.
It was a one-person play and Callow was excellent both at playing Dickens and playing characters from his novels.
Apparently, Dickens did this himself for years, nearly killing himself in the process.
I always think I won't like one person plays, but I always do.