I did some phone box hunting while in Northampton on Hallowe’en 2015 for a wedding:
(Coordinates 52°23’69.1″N, 0°89’44.6″W.)
You can’t really see from this picture, but when I was on Google Street View to find out the name of the street, I realised that there’s actually another phone box behind this one. Next time I’m in Northampton I’ll make sure to take a picture of the both of them!
Update February 2022: added coordinates. This box and its shy twin were still standing as of November 2020.