I see that Susy's maiden surname was Allsop.
So this is looking likely, from freeBMD:
3rd q 1897, Brentford 3a 179:
Susy Kidston Allsop + on the same page Arthur Henry Browne.
Susy's Christian name is also indexed as Lucy.
I would also like to trace her and details of her family.
You would need to confirm her fathers name from m/c
ALLSOP, SUSY KIDSTON
mmn KIDSTON GRO Reference: 1874 S Quarter in ST PANCRAS Volume 01B Page 169
Susy Kidston AllsopBaptism 13 Sep 1874 St Thomas, Camden, Surrey
Father
Thomas William, warehouseman Mother
Susannah JaneImage can be viewed on Anc*y London, England, Church of England Births and Baptisms, 1813-1923
1881 census RG11/280/8 p10
1, Moreland Villas, Islington, London & Middlesex
Thomas W Allsop Head Married 36 Tailors assistant Oxford, Oxfordshire
Susannah Allsop Wife Married 31 City of London, Middlesex
Susy K Allsop Daughter 6 St Pancras, MiddlesexF Kidston Allsop Son 5 Islington, Middlesex
Elizabeth Allsop Daughter 4 Islington, Middlesex
John Allsop Son 2 Islington, Middlesex
Thomas Allsop Son 10 months Islington, Middlesex
Nellie Berry Servant 16 General servant Bermondsey, Surrey
ALLSOP, FILMER THOMAS KIDSTON mmn KIDSTON
GRO Reference: 1876 M Quarter in ISLINGTON Volume 01B Page 341
Marriage 6 Jul 1872 Saint Stephen The Martyr, Hampstead: Avenue Road, Camden
Thomas William Allsop, draper
Father Thomas Allsop, commercial agent
Susannah Jane Kidston
father Filmer Kidson, shop fitter
Susannah Jane Kidston
Baptism Date 20 Jan 1850
Baptism Place Christ Church With St Mary and St Stephen, Spitalfields, Tower Hamlets
Father Filmer, mechanical fitter Mother Susannah
Added 1891 census RG12/1028/18
34, Madeley Road, Twyford Abbey Ealing, Brentford, Middlesex
Thomas William Allsop Head Married 46 Tailor Oxfordshire
Susannah Jane Allsop Wife Married 41 London
Susy Kidston Allsop Daughter Scholar 16 London, Middlesex,Elizabeth Mary K Allsop Daughter Scholar 14 Hornsey Rise, Middlesex
Benjamin George K Allsop Son 9 Scholar Hornsey Rise, Middlesex
Dorothy Kidston Allsop Daughter 4Hornsey Rise, Middlesex
Plus 2 servants