In reply to Blue Straggler:
> I somehow found myself arguing (not for long as there is no argument) with a very angry Scottish random Internet character who thought it should have been filmed entirely in Scotland with only Scottish actors. This actually felt like a bonus post credits scene
Given that much of the book is set outside Scotland and has a number of non-Scottish characters, they seem particularly ridiculous demands. It's not impossible that your random internet character latched on to the fact that the original Glasgow elements of the book have been replaced by London and has extrapolated well beyond that.