Mind your Ps and Qs

I have been delighted to see the return of beer served in quart measures, albeit in plastic skiffs at concert venues. 

Quart of beer sighted in the wild

But sadly the word quart has become archaic in British English, and there was some confusion when I asked for two pints at the bar. Did I want two separate pints or two pints in one container? If we bring back the work quart this wouldn't be a problem. 

The quarts were advertised by a sign behind the bar encouraging people to "Upgrade to a two pint cup".

The sign behind the bar

My humble suggestion is that they could start the re-education by simply adding "(quart)" to the sign after "two pint". I'm sure people would soon catch on, after all we've managed to get by a random mix of metric and imperial measurements for decades.