It does seem complicated. At 16 you can practice driving a tractor, but not on the road. At 16 you can drive to a test center to take your test. If there are two seats in the tractor you should be accompanied by a suitably qualified driver. At16, once you have passed your test, you can drive a tractor on the road if the tractor is less than 2.45 metres wide and tow trailers less than 2.45 metres wide with 2 wheels, or 4 wheels close-coupled (close together).
You can drive a tractor on the road at 16, but only if you’ve passed the DSA Tractor Driving Test. You can drive a tractor to and from the driving test appointment ,but you can’t practise on the road.
Do you have to have a provisional car licence?
Yes. Apply for a D1 application form from the DVLA ordering service or pick one up from your local Post Office. You will also need to enclose original documentation confirming your identity, a passport-style colour photograph and a fee of £50.