Imperial Hotel query

I AM anxious to find as much information as possible about the old Imperial Hotel which later became the Malvern Girls' College. There was a hotel and boarding house directory issued by Ward & Lock and Co, in 1898-9 but this hotel was not included and as Ward & Lock and Co are no longer in existence, I wonder if you know of any other similar publication which may have advertised the Imperial Hotel, Malvern, preferably showing a photograph of the frontage.