#1 - Having visited the workshop in Ashford, Kent and spoken at length with Gerard and Anne I can tell you that the liquor is sourced from various companies - it depends on the origin of the liquor. From my memory, the beans are sourced and roasted to their specs and are not "stock" products can be purchased.
#2 - It's properly spelled liquor (cocoa liquor, chocolate liquor), not liqueur.
Origin liquors are pretty widely available, but usually not in small quantities or commitments. There are people who will make them (in relatively small quantities) bespoke for you if you are interested in purchasing them and finishing the chocolate yourself.
Also from the discussion, I know that Gerard is using his chocoeasy in some pretty interesting ways to incorporate his flavors into their chocolates.
Sunita - why don't you ask them to respond to this post directly? They have a membership on TCL.
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@DiscoverChoc