Amy Passant who was a witness at Emily's wedding looks to be Emily's sister Amy. Emily was a witness to her wedding:
25th December 1928 Emmanuel Church, Camberwell
Amy Tyler,27, spinster, a labeller.Address: 18 Guildford Place. Father:Ambrose Henry Tyler, labourer
Daniel Henry Passant,28, bachelor, a joiner. Address:2 Guildford Place. Father:Charles Benjamin Passant, labourer
Witnesses: Emily Tyler and William Bosworth