Jan,
In an earlier message before we referred to the national Archives documents, you mentioned that you thought that St. John's House as mentioned in the sale in 1871, may well be Stride and Sons Estate Agents. Well...., I put St John's House into The Times archive and it came up with two results, one was the death announcement of Fanny Eyre Smith:
On the 13th Feb., at St John’s House, Chichester, Fanny Eyre Smith, wife of the late Rev. Henry Smith, M.A., vicar of Firle and Prebendary of Marden in Chichester cathedral, daughter of the late Sir William Burnett, M.D., K.C.B. Director General of the Medical Department of the Navy, aged 76.
So I looked on 1891 census, and found under the below reference :
RG12; Piece: 846; Folio 150; Page 10; GSU roll: 6095956
St. John’s House, Fanny E. Smith, widow, 73, born Chichester. Next door on either side of St. John’s House is St. John’s Mews (coach house and stables maybe)
The other advert was The Times Friday, Mar 28, 1969; pg. 16; Issue 57521; col A
This was for a house for sale by an estate agent called Stride & Sons, St. John's House, Chichester.
As for the money to buy it, well that may well have come from Edward's second wife, Charlotte Willes, daughter of wealthy churchman-her father died 1847 and she and Edward married 1849, just after he came back from Madras.
So maybe St John's House after all your photographs may in fact be Stride and Sons.
Tom