Voussoirs

Idly browsed the Historic England map to see what treasurers there were in my local area to  give me a reason to go out in the drizzle.   This bridge is just two fields away.  Its described as a Grade II  bridge. Probably early C19, limestone rubble with slate coping and voussoirs.  
Like me, you are probably wondering what is a voussoir.  I can reveal its the wedge shaped stone used to make an arch.  
And I'll have you know, that I had to get on my bottom and slither down a bank to the becks edge, to get the best view of the voussoirs.