A defibrillator box today.
(Coordinates 53°68’78.5″N, 0°06’76.8″E.)
The Street View image is from 2010 and shows that the wall behind still had an ancient ‘Holmpton Post Office and General Stores’ shopfront built into it at that point! Sadly it’s just an ordinary garage door now.
I like the sticky-out defibrillator sign on this one, though I think it’d be even better if they had ‘defibrillator’ panels to replace the ‘telephone’ ones.