From the Royal Court website:
A very limited number of tickets for £10 Monday will be available on the day of each perf from 9am online. These have been selling-out within seconds. Due to high demand for Constellations, an additional twenty £10 Monday tickets will be released at 10am for in-person customers at the Royal Court Theatre, Sloane Square. Customers can book up to 2 tickets each and early queuing is advisable.
I imagine this will transfer now, hopefully so. But - bees, quantum physics? Haven't we been here before (Humble Boy?)