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I think non-hydraulic/ air lime was what I was thinking of, I'm struggling to see the difference between that and Hot-mixed lime mortar as listed in this article.
https://www.lime-mortars.co.uk/lime-mortar/guides/the-lime-mortar-guide
I think what @jsabine is talking about its probably NHL (natural hydraulic lime).
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From that link, looks like hydraulic line mortar (so yes, NHL) is what I used - forgiving of the inexperienced, and much like cement mortar in use ...
Whatever you get if you go into a mainstream builders' merchant and look for lime mortar, basically. Straightforward to use, which suited me for our garden wall.
^^ it depends if it's hydraulic or non-hydraulic. Both are lime, but have different methods as they cure differently.
I use NHL, which is stored dry and mixed like cement, albeit left for an hour or two before applying.
Lime-putty is a different beast.