Dusting Banned in UK
I guess I must be out of touch with UK flying but at one time (74) you could crop dust in the UK. I started my career on a UK validation and dusting for Sloan Helicopters out of Sywell (Peter Nutting days for you realllllly old farts), at that time Bond had two H12E and also dusted. Well time marches on and so does change.
You might try reviewing the HAI helicopter operators directory, this may take a little time but probibly get some leads. Evergreen had a WHO contract in Africa and that continent is loaded with dusting.
Its a lot of fun,scare the crap out of you a few times but if you live through that phase of your career then go for it.
Best of luck to you and fly safe.