Hamish Ta-mé, you want to go through the https://experts.shopify.com/designers or contact experts@shopify.com for guidance.
It's one thing to look for a designer, but needing one that has not just done an alcohol site design but specializes in themAND works on shopify is narrowing your options.
Generally you want to find a platform agnostic designer have them do the art|branding get the art turned into basic html,css,&javascript code (aka slicing) THEN have any shopify designer turn the basic html-theme into a shopify-template-theme with the needed features.
