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The Marchmont Association give the address at the time as 31 Tavistock Place. Old maps show a chapel (with various names over the years) very close to this site and says it was built in 1801 between numbers 31 and 32. The numbers currently run west to east so that would put number 31 immediately on the west of the chapel. And at we found a picture of the chapel showing the house next door, to the west. So we think this shows Clarke's house.

UCL says that the Chapel was demolished in 1900 and flats built on the site. That's probably when Clarke's house was demolished too.