Thanks. I searched 56 on the 1921 census but got a different family but their result came up under no. 36 but I'm unable to check transcription errors.
Not really relevant but Rhoda's first husband emigrated to US in 1907 and was still alive in 1940. Doubtful they divorced (possibly why she didn't marry Alfred) and she may have married Arthur bigamously.
Rhoda's eldest 2 daughters were listed as Walsgrove, though on the 1911 census the youngest of these 2 is listed as Hollingsworth (daughter) whilst the elder is listed as Walsgrove (adopted daughter). So I'd guess Rhoda's first marriage broke down sometime between their births.