I am grateful to Richard Senior who writes:
For information, George Martin, who you refer to, was the brother of my great grandfather, William Martin. There was a connection between George Martin and Albert Setford. For more information, see The London Gazette HERE .
The shop at South Street, Chailey was taken on by Albert (Bert) Setford & then his son, who married Dolly & had a son. George Martin also farmed Shelley's & Tutts Farms, South Common, Chailey, I believe at the same time as running the shop. In about 1930 he went on to farm Courthouse Farm, Hamsey, Lewes, and Allington Farm, Hamsey, Lewes. Circa 1933 he built (or had built) Colinbourne, South Common, Chailey (named after Colin Godmans, Danehill & Wapsbourne Manor, Chailey, which he had helped farm as son of farmer William Martin, snr., prior to running the shop. After William Martin, snr, Wapsbourne was farmed by George's uncle, Frank Martin and then his son, George Stenning Martin. George Martin's descendents still farm in the Lewes area.