The nearby memorial garden that you can see from here was built & dedicated for the centenary of Armistice Day.
In WW2, 2 large bombs & 6 smaller ones were dropped on Buckfastleigh. One hit the town's mill, one damaged Holy Trinity Church & others went down through Buckfast, hit the road, bounced across the River & landed in a field. They were probably being off-loaded by the German pilots on their way home, possibly after bombing Plymouth.
You are looking for a small magnetic box. Please replace very carefully so that it is hidden & secure. Thank you.