Keep staring at it. Surely they understand that the WW2 vibe has been fully co-opted by the Leave side. What on earth do they think this is saying to anyone? Or maybe it’s literally aimed at marginals with an ageing population who might make the connection in order to get Boomer and older Remainers to vote Lib Dem, in which case maybe it’s weirdly genius.
(To put into context, though, I am 44, and the bit of history I am most familiar with is pre-War and WW2, and without the explanation I wouldn’t ever have twigged what this was riffing on and would have just been completely baffled.)