There were two parts - the first was generic and everyone has to do this one (regardless of how the pesticide is to be applied) it covered theory, legalities, best practice etc. Then there are separate modules for types of applicator to be used, eg. hand held, vehicle mounted (covers ATV as well as tractor) injection for knotweed etc. You could end up with having to be assessed for everything as one chap there found out as he thought having the vehicle mounted certificate would cover him legally for hand held. I only spot spray so I have only done the hand held cert. You end up with a card,like a driving licence, which shows the classes of use you are qualified for. You have to have the first part with any of the other options to be able to buy pesticide - unless of course you go to the garden centre and buy the ready mixed sort for your garden, but that's another story......!