Hi Richard
The RSPH level 2 is the recognised qualification to get, however you still need to gain experience once you've qualified, I qualified last year and I created relationships, travelled up to other companies and went out with them to gain field craft as such, I still do lots of other training courses associated with pest control and go to most of the exhibitions, the business itself is the same as the rest of the cleaning industry,lots doing it, very cut throat but not unachievable, if you're willing to put the hard work in you can make gains out of it..!
Graham