Freddie And Max (1990)
Written by Dick Clement & Ian La Frenais for Thames. Unfortunately, despite the pedigree, it wasn't terribly good.
The series was set in a swanky hotel which was home to Max (Anne Bancroft), an ageing American actress. Charlotte played Freddie, a young writer who was ghostwriting Freddie's biography. Also in the cast were Richard Pearson, Ian Congden-Lee and Flaminia Cinque.