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No, there's no legally required qualification similar to a driving licence.
Modern plant is very easy to operate, although the scope for getting yourself into significant bother is considerable...
Half a day in a mini-digger will get you up to speed; a telehandler is a bit more challenging due to the size and restricted visibility. "Your friend" would be advised to cut their teeth in an open environment: 4-wheel steering and a boom can get messy fast!
"Hello. Acme Plant Hire?
I'd like one of everything please."