... at least for the observant historian. Oscar Wilde once said 'We are all in the gutter, but some of us are looking at the stars.' Sometimes, it pays to look more thoroughly at the gutter.
William Kent's slim tome of the same name, published in 1932, has encouraged me to venture back into Saint Paul's and Westminster Abbey - among other places.
I'm not sure what the collective noun for bollards is, but I do know that there is a fascination shown on the internet for these workhorses of the London street furniture world.