This was definitely true during the Blairite New Labor days, but it's extraordinarily disingenuous to claim that Corbyn doesn't understand the needs of working Britons.
In fact, the Conservatives adopted a similar term in their campaigns of a few years ago "Working People". Apparently it didn't do them any good but it's worth pointing out.
I think Labour does understand working people and they understand working class people too - they just have lost touch their their working class roots and are middle class now.