Not that this helps finding a marriage.
Did your Maud Gavell marry a Walker?
London Electoral Register address 27, St. Peter Street, Bethnal Green
Year 1920 same address year 1934
Edwin Gavell Snr & Junior
Annie Gavell
Maud Walker
Free advanced search 1921c using above address only
Annie Gavell 1861 Bethnal Green, London
Annie Gavell 1897 Bethnal Green, London
Edwin Gavell 1852 Hackney, London
Edwin Gavell 1891 Hackney, London
Lily Gavell 1901 Bethnal Green, London
Maud Walker 1887 Hackney
Added for info.
Edwin Gavell 1853, Annie 1860, Maude 1887, Joseph 1890, Edwin 1892, Annie 1898 & Lily 1901
Address 27 St Peter St, Bethnal Green, London in 1911
Edwin Gavell
Electoral Date 1912
Street Address 27 St. Peter Street
Ward or Division/Constituency Bethnal Green North East
County or Borough Tower Hamlets
Edwin Henry Gavell
Maud Emily Walker
Electoral Date 1933
Street Address 27 St. Peter Street
Ward or Division/Constituency Bethnal Green
County or Borough Tower Hamlets
No Gavell's on ER with Maud Emily Walker year 1939