Starring Beryl Reid and Richard O'Sullivan, it lasted for one series.
It was written by Johnnie Mortimer and Brian Cooke, who later wrote Man About the House, in which O'Sullivan was the lead male character.
The companies, whose headquarters are above a strip club in Soho, include Sotheby's Racing Service Ltd and Hugh Blanding's Detective Agency.
The elderly Ernest is her office assistant, while her partner is Richard Gander.
The Complete Series of Alcock and Gander was released by Network DVD in the UK (Region 2) on 26 November 2012.