I'm in the middle of the killgerm foundation courses, 2 day insect course, 1 day rodent course and 1 day safe use of pesticides. Once you have done these you can buy the chemicals but you still need the practical experience. You would also need an airgun course, mole course etc etc. I'm just going to start with wasps nests this year but you can set up for most things for about £1500. I am looking for another avenue if the drains come to an end