Allison & Busby publish (or re-publish) several of my favorite authors, including LC Tyler, Edward Marston, Jonathan Gash, Laurie R. King, Jacqueline Winspear and others.
Right now A&B have three omnibuses of titles on sale in the UK for £3.49 each:
The Maisie Dobbs series – Books 3, 4, 5 by Jacqueline Winspear contains Pardonable Lies, Messenger of Truth, and An Incomplete Revenge
Buy at Kindle UK
Home Front Detective – Books 1, 2, 3 by Edward Marston contains A Bespoke Murder, Instrument of Slaughter, and Five Dead Canaries
Buy at Kindle UK
Cotswold Mysteries Collection by Rebecca Tope contains A Cotswold Killing, A Cotswold Ordeal, Death in the Cotswolds, and A Cotswold Mystery
Buy at Kindle UK