I am afraid my photo is only a copy, and I am not sure if the original exists, I believe it may be a copy of a copy.
Have done some juggling with dates and even assuming my grandmother is 15 (1903) none of the sisters were married. Have been trying to think of a reason for this formal photograph, as I know often it was to mark a significant occassion, but cannot seem to see any clues from it.
As the 2 sisters used to always dress alike I wondered what else they might have done together and I have found them both in the 1901 census working in the same household, one as a domestic nursemaid and the other as a domestic servant. (I had missed this earlier as one of them had been transcribed incorrectly and so hadnt come up when searching) They would both have been in their early 20s at this time so I presume they had worked elsewhere previously.
A mystery I shall never know the answer to, but I do have a timeframe for the date of the photo which was what I originally wanted to know.
Thanks again.