I really would struggle to think of a better way to spend a very cold and windy Saturday afternoon, than mixing gorgeous cocktails in the glamorous confines of Bar Opus, based at Birmingham’s One Snowhill. One of the city’s newest destinations when it comes to cocktails, Bar Opus is in a part of the city that is currently experiencing vast changes, as the Midland Metro route is being expanded through the business district. Bar Opus has an extensive cocktail menu, and offers a one hour mixing masterclass for £15 per person, I was invited along to have a go at mixing two different cocktails, and must admit to being a…