Closer to (non-rhotic) eh-r, dersh, I would say. But, travelling as he did, I'm sure he was used to all sorts of pronunciations and accents, so I doubt he'd min

Closer to (non-rhotic) eh-r, dersh, I would say. But, travelling as he did, I'm sure he was used to all sorts of pronunciations and accents, so I doubt he'd mind overmuch.