It might be Empire Day which would place it on or after 1904 when the event was started or just possibly to mark the end of the Boer War which was two years earlier.
And it will hang on which of the women in the picture is Annie Holland. She was born in 1889 and grew up around on Cobden Street in Salford and was the grandmother of Alan who has kindly allowed me to use three family photographs of Annie.*
Now this is not the youthful face that stares out of us from the earlier photograph so I minded to think we must be mch later, but just when is still unclear.
*Annie Holland in Salford in 1911
Picture; Salford Mill women courtesy of Alan