When Jack and Victor first enter the charity shop, Victor says they both come from Craigbank, instead of Craiglang.
Just after Winston gets barred,Jack and Victor are walking outside a shop,members of the public can be seen inside staring at the camera a woman in a white top and 2 men.
Although not mentioned in the filming locations the charity shop is located in Clydebank shopping centre. This may explain , as mentioned before , that the area of Craignank is mentioned as the home of the characters instead of Craiglang