From the BBC7 website: 
There are three more classic mystery series coming up as from
Monday, beginning with everyone’s favourite Belgian private detective,
Hercule Poirot, followed by tough-as nails American VI Warshawski, and
finally the Franciscan priest and philosophy lecturer who’s always on
hand to solve a crime, Paolo Baldi .

Murder in Mesopotamia
In this Christie classic there are strange goings on at an
archeological dig. Happily, Poirot is brought in and hopefully his
logic will solve the crimes. John Moffat and William Franklin star in
this splendid production directed by Enyd Williams.
Monday to Friday, 9am, 8pm and 1am. (BST)

Sarah Paretsky’s thriller
Deadlock, dramatised for radio also starts on Monday
and stars Kathleen Turner as V.I Warshawski and  it is directed
by Janet Whittaker. 
Weekdays at 9.30am, 8.30pm and 1.30am. (BST)

Baldi :
‘The Prodigal Son’ in the first of this series, Baldi
accidentally solves a murder at an Italian chip shop. In ensuing
episodes he has a very busy time: caught up in the murder of a leading
academic, he investigates the mysterious circumstances surrounding the
tragic death of a nurse at an old people’s home, investigates a murder
at a leading Dublin hotel and a sudden death amongst the Franciscan
brothers at a monastic retreat far out in County Cork causes Paolo to
suspect foul play. Phew!

The Baldi series is written by by Barry Devlin, Simon Brett, and Annie Caulfield. It stars
David Threlfall, Tina Kellegher, Owen Roe and T P McKenna and is directed by Lawrence Jackson.
Monday to Friday at 1pm and 5am (BST)