Ancestry: British Phone Books - 1880 - 1984

1925
W G Whittle : Provsn Mrchant, Market Street, Cinderford
telephone: 79

1928
W G Whittle : Provsn Mrchant, Market Street, Cinderford
telephone: 79

1935
W G Whittle: Grocer, Market Street, Cinderford
telephone: 79

1937
W G Whittle: Grocer, Market Street, Cinderford
telephone: 3179

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Not mentioned after that. Unfortunately, can't search without a surname to see when and who took over.