You will have to take your C test first...that is to drive a rigid vehicle of over 7.5T. If you want to drive an artic or wagon and drag, you will then have to take the C+E ( vehicle over 7.5T with a trailer over 150kg [Ithink!]). Theoretically, you could take C and take C+E immediately after, but I have never heard of anyone doing this. In the old days you could go for a double L (no car licence, so L for that; no HGV licence, so L for that) and take one test in an artic and get your car licence at the same time...scary! Don't forget you now have the added complication of the Driver CPC (Certificate of Professional Competence). This requires 35 hours of training every 5 years, but for new drivers, must be completed before they can drive after passing their test. This is usually taken as 5 7hour/day courses and is generally accepted as being a total waste of time and money (there isn't even a test...you just have to attend), but thats the EU for you! This will cost about £60 a session, so about £300 to get your DriverCPC card (which amazingly is free!).