Sorry for pestering you BorisG, but this isn't enough information to add the defibrillator to the map, and I don't want to leave you with the false assumption it's been added to OpenStreetMap.

Typically when adding a defibrillator, we add a "tag" called "defibrillator:location" which can give people clear instructions on where to find it. In an emergency we wouldn't want to send people on a treasure hunt to find it!

If you are able to use a computer and log in to openstreetmap.org (which you may already be doing), you can press the "edit" button in the top left, add a "point", search for "defibrillator" and add it in the correct location. It would further be useful if you could add a wall or telephone box in which it resides.

Alternatively, you can install "streetcomplete" on your phone, take a picture and post it as a response to this note.

Otherwise please leave this note open for myself or another OSM user to locate next time we are in Latimer, so we can map it correctly. :)