As I understand the situation, the clock on A3s sold in continental Europe are fitted with radio transmitter clocks that pick up the transmissions from the German atomic clock transmitter in Frankfurt that are always accurate to the second.
Cars for the UK market are not fitted with these clocks because of our 1 hour time difference. Why they don't fit one tuned to the UK atomic clock transmitter based in Rigby I don't know. Having to produce a car for RHD it would seem a small addition to have a different clock.
I have several clocks in the house that pick up the transmissions from Rugby but I also have a Junghans alarm clock and a Junghans watch, both of which pick up their signals from Frankfurt. All you have to do is adjust them once when they are new to be one hour back and they are then right for ever more. Continental Europe changes it's clocks for summer time in the same way and on the same date as us, so the clock/watch always adjusts automatically as necessary.