Although you may find that UK dealers don't stock & can't get hold of some of the accessories that the US dealers can - e.g. lots of the ZM specific stuff.
I've been trying to get the tailored rubber mat (cargo liner) for the boot, the ///M boot carpet, the solid steel pedal covers, etc. but the UK dealers can't even see the numbers I supply on their systems and say they're not available in Europe.
The only option for some parts is to order from the US and pay the shipping, VAT & duty when they arrive - which turns out very expensive for a carpet.