This is a possible match - not unknown for ages to become distorted-

Needs further investigation

1901
Ellen Meredith abt 1877 Cinderford, Gloucestershire, England Servant Twickenham, Middlesex Cook

Name: Eleanor Mary Meredith
name: Percy Thomas Cassidy
Year of Registration: 1908
Quarter of Registration: Apr-May-Jun
District: West Ham
County: Essex, Greater London
Volume: 4a
Page: 148

1911
CASSIDY PERCY THOMAS M 1880 31 West Ham Essex
CASSIDY ELEANOR MARY F 1883 28 West Ham Essex ( from Gloucestershire)

Name: Peter W Cassidy
Year of Registration: 1915
Quarter of Registration: Jan-Feb-Mar
Mother's Maiden Name: Meredith
District: West Ham
County: Essex, Greater London
Volume: 4a
Page: 770

Name: Peter William Cassidy
Birth Date: 22 Jan 1915
Death Registration Month/Year: Jul 1997
Age at death (estimated): 82
Registration district: Hastings and Rother
Inferred County: East Sussex
Register number: A62A
District and Subdistrict: 4561A
Entry number: 129

Name: Noreen E Cassidy
Mother's Maiden Surname: Meredith
Date of Registration: Jan Feb Mar 1919
Registration district: W Ham
Registration county: Essex, Suffolk
Volume Number: 4a
Page Number: 572

Name: Eleanor M Cassidy
Death Registration Month/Year: 1964
Age at death (estimated): 81
Registration district: Barnet
Inferred County: Middlesex
Volume: 5a
Page: 547