Just realised that I've not mentioned the source of the 3d printed chimney pots....
Richard Slate, Mudmagnet on RMweb, is an old friend from our days on the exhibition circuit in the SW. He's got his own company "Mudmagnet Models" which started as making buildings and layouts for people. In recent years he's moved into 3d printing.
mudmagnet-models.sumupstore.com
The pots were a special commission, which I'm sure he'd be happy printing for others, and should satisfy my chimney pot needs for the entire layout.
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I collected these from him at the Stafford show late last year. Amazing what can be produced these days.