I'm not sure if this is an actual bollard or if it is a piece of previous functioning street furniture that has now turned into a rather nice looking 'ornate' working bollard.
The bollard has a circular base that rises at an angle (see picture below) and then merges into a tapering ridged body that then flares outwards. The top of the bollard looks like it has been capped off and maybe this was previously a street lamp of some sort/design.
Bollards of London...
PS after a short break I'm back and have an amazing collection of #guestbollards and bollards from around Britain which will appear here or at www.bollardsofbritain.blogspot.com