The vast majority of the UK population, as elsewhere, is right-handed. All else being equal, i.e., no difference in acting ability between left-handers and others, we would assume that left-handed performers on the West End will make up a minority of actors in most cases unless the shows specifically require the talents of such performers (Waiting for Lefty, maybe?).
Thus, when left-handers emerge on stage way above their population levels (around 3% for this subset vs. 31.7% of all West End musical actors (2019)), theatergoers can be forgiven for thinking that the selection process is skewed. As talent is presumably evenly dispersed among the population, these groups are clearly being chosen above the remaining 97% of actors for other reasons. Any idea what that could be?