|Royal Borough of Greenwich...|
The bollard can be found on King William Walk at the entrance of a passage way to Greenwich Market. Its a tallish slender cylindrical shaped bollard with a domed top.
The #guestbollard feature on this post (above) isn't a bollard but it's a sign which is rather obvious in its message, a bit like a bollard you'd think ? Thank you to @sarahloveslists on the twitter for this wonderful picture/sign.
Bollards of London (with a Caution)...