TrigpointingUK

Wahey Thank you. It's probably staring me in the face on the link you posted but is there any way of establishing when the mark was made?

We're talking about the right place.
Apparently when some civil works were going on nearby 5 or 6 years ago, a chap in a hi-viz top and a safety helmet carrying a theodolite asked my wife if he could look at the mark. Before that we had no knowledge of it being there, seemingly this chap did, so I ...

My house has this mark on it. Can anybody tell me if it is, or ever has been, of any significance.
The file information of the picture gives its location as Lat. 53.25.33.95 Long. 2.10.16.72