I don't really think Kevin Whateley is a bad actor at all, but I had to sacrifice him for the sake of a cryptic clue. Lewisham
is the right answer.
Incidentally, the term "ham" in relation to acting is short for "hamfatter". In times gone by, the less successful members of the acting profession were poorly remunerated, and being unable to afford cold cream, which was very expensive, used ham fat to remove makeup. So mediocre performers became known as hamfatters.
T777, you have the staff. (Given the theatrical tone of this clue, perhaps it's better to say you're travelling on ticket.)