 Collins' retirement, however, did not mean an end to his interest in architecture and town planning, and in January 1962 a letter from Collins, sent from his Carlton Crescent address, was published in the "Journal of the Town Planning Institute".Collins' housing estates have a distinctive style, usually with rows of terraced houses set around wide areas of greenery.Collins also made plans for a garden city around Marchwood, but these proposals were unrealised.