The beer batter couldn't be simpler. What I usually do is take a random amount of all purpose flour and a bit of salt and add beer until the batter is still quite thick, almost as thick as store bought vanilla custard. I coat the fish in seasoned flour, batter and then roll the fish trough panko breadcrumbs and really pack/pat the breadcrumbs on the fish. If you want I can write down measurements next time . And the nice thing is, that batter will work with anything. I've tried chicken, courgette, prawns and even banana.