Saw this at the Glasgow Film Festival earlier this year. Went in blind, my girlfriend was working the festival and suggested Gutterbee. Being Scottish, Ewen Bremner drew me in right away, as well as the excellent Anthony Starr, who I had just seen in The Boys.
Plot is weak at some points, have to suspend your belief a lot, some scenes were unnecessary. But on the whole a hilarious film and a hidden gem, not one subpar performance. Wonderful!