Licence / certificate needed will depend on:-
On the road or public space or gated off private land?
For work or personal use?
1, Tracked digger or wheeled digger?
Tracked digger Cat H
Wheeled digger dep on weights and usage.
2, Agricultural tele handler or industrial one?
3, An agricultural tractor can be driven on a cat F licence. All car drivers get one when the pass cat B However this use would not be agricultural so would need either C1 or C dep on MAM of the tractor. Plus the E add on if towing a trailer.