I'll vote for that
I used to work in the Black & White plant on Stepps Rd (not as an employee). You had to watch out if the staff offered you a taste. None of your quarter gill short measures there. When they told you where to go and find it (of course it wasn't legit (or taxed)) you would find a full plastic cup from the vending machine. The rest of day was very pleasant.
Better still, the line I worked on was all for export and so much smoother than the domestic product. True or not I don't know, but the workers told me the stuff went for £70 (1980's) equivalent a bottle in South America, but I believe it as the bottle neck was fitted with a one way security valve so you couldn't pour anything into the bottle when it was open.