Hi there anthony, thank you for your post to the unofficial Sam Smith's forum.
If you were to take a handheld TV into a Samuel Smith's pub and watched it then unfortunately you would probably be in breach of the company policy. Playing music is also not allowed in any pub as no PRS fees are paid, I believe.
As far as I am aware of no Samuel Smith's pub allows music or TV in the public area of the pub. This is a measure to apparently save costs for the brewery.
Hope that helps?
DB.