The reality here is that modern beer dispense systems are designed to prevent this practice ever being necessary. Be it cask or keg beer ‘pulling off’should not be carried out.
The above statement is published on this site. As a drinker of 40 years experience I disagree with this. The pub, and the line leading to the bar pump is warmer than the cellar and “first pints” are often warmish and flattish, even in a cask marque acreddited cellar.