If you missed it when it was on BBC Radio 4 Extra last time in September 2011, this series is repeating on BBC Radio 4 Extra.
Includes Valeria Woodville, Wilkie Collin’s lady sleuth; Violet Green in an Anna Green adaptation; L. Meade’s Florence Cusack and Catherine Pirkis’ Loveday Brooke.
All four are available immediately and will remain so for about 30 days.
http://www.bbc.co.uk/programmes/b00crbrs/episodes/player
[Thanks to albie for the head’s up. ]