I'm not trying to be a clever sod here but £150pw on drink = £7,800 over the year.
Whatever - it's a hell of a lot of money to be spending on booze.
I spend about £15-30 pw on alcohol free beer (sometimes less) and am very aware of what I am spending.
Yes I worked it out as £600 per month X 12 months. He's spending about £50 a night on booze when he's out, that's in about 5 hours.
I guess everything looks expensive when you add it up and you have to spend your money on something. For me personally it's excessive. I couldn't drink that much in a night I'd be wiped out.