Dear Doris, thank-you so much for your patience, I will not be remembered on this planet for my computer skills.
Dear Doris, the marking is HS which led me to think it was Solomon Hougham of London. What I think is very interesting and I'd love your opinion is the inscription which is identical on both sides of the pot and reads:
Presented to Mr George Stephenson as a testimonial of respectful esteem by the workman under his immediate superindendance at Messrs Peters & Sons Coach Manufactory
Thank-you for your time and effort, I think the inscription could be the key to the value of the item, if it does turn out to be 'the' George Stephenson.
You have been very helpful, Thank-you, Anthony.