For the past couple of years I've kept my eye out for the older type of cannon/ball bollards. There are very few around, most having being replaced by newer 'fake' ones. I've seen the other type you mention in Pall Mall and a few other places...if you mean the ones painted black and white. Here's some of the older type:
Caryl Street has a row, of about a dozen, short cannon-type bollards. I don't think I've seen this small type anywhere else, in these numbers. Recent work installing railings around the houses, could mean these have to be removed.
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Leather Lane, Princes Street, Lower Bank View. These all have a style that I thought was the most authentic of a cannon/ball. I have pics of these ones, somewhere.
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