Duke of Richmond Map...

I went for a longer walk today but didn’t really get any photographs worth blipping so you have this blue plaque.
The Duke of Richmond, Master General of the Ordnance ordered ‘An Accurate Survey and Measurement of the Island of Guernsey ...': map of the island, on two joined sheets. Scale: 1 inch to 900 feet. Compass indicator. In 1797 William Gardner carried out the survey which was engraved by J Warner in 1795. 
Any property shown on the Duke of Richmond map which is still standing is entitled to display a blue plaque like this one on their wall.