I wouldn't worry about a bore that is a little rough as much as I would be concerned with what look like cracks in the wood on the top of the grip. A rough bore won't keep you from shooting but a cracked stock sure will!
Did you get a full condition report on this gun?

Bore condition opinions can be very subjective. What may be an expected condition to some may not be for others and the British trade sees a LOT of rough guns.