Your provisional licence will entitle you to drive tractors as it should have a category F on it.
You can get a provisional licence for a tractor at 16, but you can’t practise driving them on the road until you’re 17. The only exception is when you’re driving to or from your practical driving test.
Once you’re 17 you can practise driving a tractor or specialist vehicle on the road even if you haven’t passed your test.
If the vehicle was made with a passenger seat you must be accompanied by a qualified driver. Removing a seat is not allowed.
If you’re 16, you can only drive tractors less than 2.45 metres wide and tow trailers less than 2.45 metres wide with 2 wheels (or 4 wheels if close coupled).