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In September 1810 John GRAHAM was in lodgings in Edinburgh and writing to his brother:
"I'm now with Mrs. Rose no. 5 E.RICK STREET, a very comfortable lodging I have and a good room I find I could live very comfortable and happy in Edin. - if I had plenty of cash. I have drawn about 20£ from Mr. HUTTON. We expect to open our new shop a week or two now."
Mr HUTTON's shop might possibly have been a linen or silk mercer.
From your post Robert HUTTON looks a strong candidate but the 1825 Trade Directory entry for David HUTTON makes it a more challenging search. Whichever Silk Mercer we are talking about, the following, from the same letter dated 9th September 1810, will be of interest: "We expect to open our new shop a week or two now It is just about finished. A man who lived above it opposed Mr. Hutton and would not allow him to take down a partition till it was determined by law in favour of Mr. Hutton that is the reason why it is so late in opening"
John Graham, the author, came from a farm just north of Longtown (Cumberland border with Dumfriesshire) and went on to establish a partnership in London, first in Oxford Street and then in High Holborn. John might have served an apprenticeship with Mr Hutton. If you know more about Mr Hutton's apprentices I would be really interested to know.