as a British-English speaking person, you would rhyme it with 'dark' and 'park', wouldn't you? (please say yes!)
to rhyme it with 'jerk' is the American way, isn't it?
Or has the pronunciation shifted? Just been watching 'The Promise' (Channel 4) where the British characters keep saying it the American way (and it is supposed to be in the 1940s as well!) and it is doing my head in!
DD's friend also recently told me her mother is a 'clerk' to rhyme with berk/jerk.
Clerk to rhyme with park now. But I wonder if it did have a pronunciation shift at some point. I'd be surprised if it changed between 1940 and now though, so God knows what the c4 production company was doing.
Yes, there are quite a few other words in Englsh where "er" is pronounced "ar". E.g. Various place names like Hertfordshire, Berkshire, Derby, etc. (also, remember the Darling Buds of May and "parfick"?)
Apparently around 1800 there was some change in pronunciation among certain social categories in the UK which led to the "ar" variant. For some words, the new pronunciation stuck. This didn't cross the Atlantic, so in American Englsh the old pronunciation is still used. Or so I have read.