A latter-day mason's mark?

The puzzle in this photo is: when were these loggerheads put up?   

This is the early nineteenth-century building, in Dogpole in central Shrewsbury, which is still known as the Mountford Carriage Works, even though Mountford & Company had left by 1916.  (Edward Burd, the owner of next-door Newport House, seems to have disliked the noise the works made, and forced them out).

In 1917, the new owners of Newport House were the local Borough Council (who then resurrected the house’s old title - The Guildhall) and then (in the 1940s?) took over this adjacent former carriage works building.
Did they put up the loggerheads as a 'proprietorial' sign at this time?
The second theory is that the Dogpole roadway was widened outside Newport House, some time, by the borough’s engineers - who put up the loggerheads as a sign of their work - a kind of latter-day mason’s mark.

However, I’ve never found proof of either theory.  Does anyone have thoughts to add?

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Anonymous planter

 
You'll see a number of lead planters/troughs around Shrewsbury, some of which go back 250 years (see Shrewsbury Library planter for example).  However, the story of this one is not clear.  It bears the loggerheads and sits on the wall outside St Julian's Church, but otherwise it's rather anonymous.
Can anyone help us by giving us any clues to its story?  

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Visitors' loss

 
Oddly, now and again, you DON'T find loggerheads when you really would have expected them.  Shrewsbury Bus Station is a building that is dreary beyond belief, so it would be enhanced by a set of loggerheads - but not one is in evidence.
Also, you'd have thought that a loggerheads would be prominently displayed anyway, just as an identifying form of welcome for arriving visitors.  But no.

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