macplaxton:
Going back up a few posts Orys, if you’re driving trucks, details of the Polish licence have to be registered with the DVLA within 12 months.
Yes, you’re right. That’s why I have British counterpart license to my Polish photocard, I have GB driver number, I can accept fixed penalties, have some additional entitlements (I have bus provisional license valid in GB) and I am treated as Full UK license holder by insurers.
There are some interesting things about it:
This situation gives some advantages: for example I still have my Polish photocard, so if I complete 12 points, the court might ban me from driving IN BRITAIN only. They can’t take my Polish license away, as that’s not them who issued it. So if such case happened, I can move to France and start working as a driver there and as long as they won’t send me to UK I will be fine 
Saying that I am fully for europeanwide system of driving bans and I hope never to have to use that loophole 
But there is another reason why I don’t want to exchange my Polish license to UK one: I did my lorry license before European Style CPC was introduced in Poland. Before that we had some slightly different CPC system and your medicals were attatched to it, not to your driving license. You had only some basic medicals and then if you wanted to work as a lorry driver, you had to obtain your CPC with medical examination much stricter even that what you have in UK now (a bit similar to what plane pilots have).
So both my B and C licenses are valid for unlimited period of time, but I wasn’t allowed to work in Poland as I never did this old style Polish CPC, as my intention was to work in UK and as for UK law, all I needed was European Driving License…
This is another interesting loophole: it means that you could get work in Britain legally without need of proper medical examination! This loophole is now closed, as now they don’t do unlimited licenses in Poland any more and medical examination is just the same as the ones you have in UK (although to be employed in Polish company, you still have to do this pilot-style medicals every few years and carry certificate of them in addition to your European Style CPC .
Off course I was in perfect health when I came to UK, but I never had it in writting 
What mattered more for me that in that old system for example when you are too old to drive lorries for living, your CPC would be withdrawn from you, but not your rights to drive lorries. Therefore you can for example buy one of the Unicat campers or some vintage truck and still drive it legally as because you don’t do it for hire or reward, you don’t need your CPC 
That’s the main reason why I am not to keen to exchange my license, as if I exchange it to British, they make it 10 years only and then if I ever come back to Poland, they won’t just give my old one to me, but they just re-exchange my British again to Polish and as a result I will have Polish license valid only 10 years…
They don’t do unlimited licenses any more, so you can’t obtain it, but they can’t take it away from you as the law don’t work backwards 
So even if the system will be unified (which I am all for), I will still be some exotic weirdo on grandpa’s laws 