I'd imagine as much as they can get away with!
Inflation has gone up 10ish%, MG UKs bills will have risen even if the factory costs haven't. The corporation tax is jumping to 25% so someone has to pay that.
The pound has fallen just under 10% against the dollar since last year but it fell a lot more which would have cost someone some money which they may want to get back or hedge against further falls. My brother in law works in importing and deals with lots of Chinese factories and they generally like to paid in dollars.