Thanks to Google I found the answer to this (this post in particular) on my first attempt. I doubt I’d have worked it out on my own.
It seems that in Linux Mint (presumably Ubuntu too) that if you have any desktop effects enabled (Preferences / Appearance) then it’s not possible to give your workspaces individual names. i.e. Right-clicking on the workspace windows won’t offer the option to change workspace names unless Desktop Effects is set to None.
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