Which BBC Radio sitcom stars Rita May, Christopher Douglas, and Philip Jackson? 
Rita May (actress):  She has appeared in popular television series such as "Early Doors" and "Drop Dead Gorgeous", and radio programmes including "Ed Reardon's Week" and "The Blackburn Files". Ed Reardon's Week:  The names of two central characters, Ed Reardon (played by Christopher Douglas) and Jaz Milvane (played by Philip Jackson), are references to the characters Edwin Reardon and Jasper Milvain, who appear in George Gissing's 1891 novel "New Grub Street", which is set in the hack-literary London of the late 19th century, although Edward was revealed to be his given name in the second episode of the third series and Milvain is referred to as Jaz Milvane.
"Ed Reardon's Week"