During the early 1920s Power was producing watercolour landscapes and townscapes as well as the first of some 40
drypoints. In 1918, Power met
Sybil Andrews, with whom he maintained a working relationship which lasted some 20 years. His youngest son Edmund was born in December 1921, in Bury St Edmunds. Shortly after their first joint exhibition in Bury St Edmunds, the family moved to
St Albans,
Hertfordshire. The two artists did the work together, signing the prints "Andrew-Power"; in total, eight poster designs were produced. In 1930 Power was elected member of the
Royal Society of British Artists and established a studio with Andrews in
Hammersmith close to the
River Thames, a location which inspired many prints by both artists, most notably 'The Eight' by Power and 'Bringing in the Boat' by Sybil Andrews. Their first major joint exhibition was at the Redfern Gallery in 1933 which consisted of linocuts and
monotypes. The following years saw many more joint exhibitions until the dissolution of their artistic working partnership in July 1938 when they gave up their studio. Andrews moved to her cottage 'Pipers', near
Lymington on the
Hampshire coast which Power had modernised and enlarged the previous year. She met and married shipyard worker Walter Morgan during the war in 1943, and emigrated to Canada with him four years later. Power rejoined his family, who had just moved from
Hertfordshire to
New Malden in Surrey. ==Later years==