orys:
Simon:
It’s the same thing as European trucks driving around with no mud-wing tops on their unit. It is legally ok in their country, but you’d get pulled for it here because it isn’t legal for our trucks.But surely you can’t get a ticket for it? Due to Vienna convention and all? As I am afraid to go to Poland now, as it’s illegal to have RHD car there…
A foreign registered vehicle has to comply with their own Construction & Use Regs, even over here in the UK. The majority are fairly common throughout the EU and further afield. There are some variation in the exact details, for example artic unit mudwing tops. Some EU countries C&U Regs allow you to drive a unit and trailer without them. UK Regs do not, so a UK registered vehicle can’t do that without risking a ticket.
If that’s due to the Vienna Convention, then fair enough.
You should be ok in a rhd car in Poland, if it’s a UK registered car. I suspect you wont be able to re-register your rhd car in Poland though 
I wouldn’t know about Polish C&U regs, or import regs on this.
We can’t register a newly built lhd motorbike and sidecar in this country. They are illegal here.
I know a bit about this, because I’ve got one. Mine was built specifically for me to export to Germany. I lived and used it there for 7 years and then re-imported it. I was able to re-register it in the UK because of its history and had all the supporting documentation.