No, I think it's G-MIDZ for the DME services. Besides, I don't make the immediate connection between leather seats and high-quality service.

Incidentally, the FSM said the dedicated DME aircraft would be getting long-haul-style seats. It wasn't clear (to the FSM, at least) if it was exactly the same seat as on the A330s, nor was it clear what happened if the dedicated DME a/c went tech...