Jane Onslow How (born 21 December 1951) is an English actress with a range of television, film and stage credits. She is best known for her role as Jan Hammond, the mistress of Den Watts in EastEnders. She appeared in the programme regularly from 1986 to 1987 and also made brief return appearances in 2002 and 2003, the latter leading up to Den's return to the show.