It wasn't particularly PEL's. It was anything that needed paying for and any kind of licence. That includes Sky, PRS licences, MCPS etc etc. Because there i

Sam Smith's pubs only sell Sam Smith's products. They sell lager, gin, whisky etc made by Sam Smith's.

It has to make some sort of business sense - beer is around £1.30 a pint. (Not a typo for you southerners - one pound thirty pence).