I found a mention of W Cottier Cubbin for 1905 on a link from an earlier posting, but the details were sketchy about period of operation.

Can anyone give me a likely date range he was operating from the following premises?

Under Royal Patronage
W. Cottier Cubbin
Photographic Artist
Royal Studios
26 Finch Rd
Douglas, I.o.M.
Derby Castle” Studios.

We are trying to narrow down the date range to figure out likely suspects for a photo we have.