I don't think any sane person expects everyone in an Elizabethan era television drama to speak Shakespearean English. But is it too much to expect the folk in some detective drama set in England before 1975 not to talk about being "across" something? I don't remember when that phrase sadly entered the British lexicon but it wasn't that long ago. Certainly not before the 1990s. Nor did British people use that horrible trite American euphemism for dying, "passing". Not a part of everyday speech in 1950s or 60s Gloucestershire. I can see why the casting director wants to make Gloucestershire after the Second World War look far more multi-ethnic and multi-cultural than it was in a bid to pander to the "We want to see people who look like us on television" crowd. But it's a lie. And lies should be avoided. Though I would hate it if such programmes turned into a nostalgia-based fodder for racists. The kitschy television adaption of the Hamish McBeth stories erased the village Asian shopkeeper of the original books and replaced him with a white guy. That probably wasn't racism but more an example of the mess made of the adaptation.