The Grimsby Astronomical Observatory?
I came across this very short article and I don't know if it was actually built or if it was an astronomical observatory of just a tower. Maybe someone who has knowledge of the Grimsby area will have heard of this.
Bradford Daily Telegraph Wednesday 24th May 1899
The Mayor of Grimsby has promised to erect an observatory in the public park. The observatory is have an approach of 80 steps to correspond with Her Majesty’s years of life.