hello both
as you say viktoria re the nightwatchman those were the days no flashing lights then just a hut and the old coke brazier and usually an old boy who was either retired or near to it , and regards the fire ins companies back in the 18th c all ins co,s had there own plaques one of the most famous was the sun ins co who had a lead plaque with the sun symbol and the policy number stamped on it nailed to the outside of a property a lot of ins co,s had there own fire service crews as well .
sorry to repeat a lot of what you,ve posted viktoria just trying to elaborate a bit more on your post

best wishes
trevor