The couple found by Kay99, who married in Wincanton in 1916, look to be the most likely parents of Margaret, they lived in Swanage.
Albert's death was registered in Poole in 1959. Albert Joseph HUNT of 18 Bell Street Swanage died 16 January 1959, Administration to Florence Rose HUNT widow. From Probate in 1978 Florence died 11 November 1977, still living at the same address, no name given to whom a Probate was granted.
In the 1931 Electoral Roll they were living in Osborne Road Swanage
There was another daughter Olive Beatrice E born in 1923, birth registered in Wareham.