Watch for you know not the day nor the hour

[Ryewolf]

I'm not sure why this cross was placed by the side of the road....

Okay, so a quick Google reveals all:

The Pinfold Cross is a memorial to a former servant at Stonyhurst College and fiddler, James Wells, who fell to his death in a quarry nearby on 12 February 1834. It was erected in 1834 at Stockbridge. On the front is inscribed the legend, ‘WATCH FOR YOU KNOW NOT THE DAY NOR HOUR.' Above this is written, ‘OFT EVENINGS GLAD MAKE MORNINGS SAD'. On the left is ‘PRAY FOR THE SOUL OF JAMES WELLS' and on the right, ‘DIED FEB. 12TH, 1834'

[kev7d]

A sad tale. That’s quite an imposing structure.  

[Ryewolf]

Thanks Kev, a sad tale indeed and thanks to the miracle of the interweb easy to find out the why and who behind it.