^^^ I've run bars, including doing the books, so I know all about the mark-ups.
However things still seem to be following the same rules of thumb that have always applied. i.e. in a social club (where you don't intend to make much profit and/or you've got volunteer bar staff) you double the purchase price of the booze you buy to give you the sales price. In a pub you treble it and in restaurant you quadruple it.
e.g. if you're buying in your lager at £1.50 per pint, you sell it at £3.00 in a club, £4.50 in a pub and £6.00 in a restaurant. Similarly if you buy a bottle of wine for £6, you expect to get £12 from the sale of its contents in a club, £18 in a pub and £24 in a restaurant.