Sutton Harbour Group PLC engages in marine activities and property development, primarily focusing on revitalizing waterfront areas in Plymouth and the South West of England. The company operates marinas, a fish market, and various commercial properties, generating income through leasing and property management. Its portfolio includes investment properties and development sites, with a significant emphasis on the former Plymouth Airport site, which is held as development inventory. The group serves local businesses and the tourism sector, contributing to the economic development of the region.