@Edent Surely that depends on how many hours you are supposed to be dedicating to it? Remember that academic *study* - and PhD is still study - is aimed primarily at early adulthood, and yes these days students are expected to supplement their upkeep during study, with additional paid work. (I'm not endorsing the view, but that is pretty much how it works.)
Β£19237 at NMW of Β£11.44/h is 210 8h days. Which leaves 50 of the year's work days free for other earning or holiday activity.