Alison's great, although Brewlab have been a bit funny about supplying homebrewers in recent years - I guess it's still fairly quiet for them due to Covid and the time of year so they'll be OK, at one point they tried to offload all their homebrew supplies to the new Hop & Grape but I suspect that's not really worked out for them.
Make the most of it if they are taking homebrew orders - they won't directly link yeast to the brewery, but if you say you are trying to clone something, they will usually have something suitable - in the case of Black Sheep the yeast will be labelled HH, and by coincidence Black Sheep got their yeast and squares from Hardy & Hanson. They're particularly strong on the northern British yeasts which are underrepresented in the US yeast labs - something like CC is fun, as cire can confirm....