Any Real Ale I fear will be off by now as the pubs aren't open (in the UK). Plenty of willing customers but we're not allowd to socialise in pubs or anywhere else.
If you pour undrinkable beer down the drain you need a licence from the Water Company (well we did at a small brewery) and the Excise Duty still needs to be paid unless the unsaleable beer is collected by the brewery. Doubt that will be happening. Maybe someone is devising concessions.