Lets just clarify a few things about the BPCA.
Firstly, I'm not sure what you think they were saying, but I can assure you that the BPCA would not condone the use of any pesticide without following the label instructions.
Secondly, you do not have to sit a BPCA course to make yourself eligible to buy rodenticides. The BPCA are just one of the many training providers who will train candidates to sit the RSPH level 2 certificate in pest control, which is now considered to be the 'entry level' qualification for the pest control industry. The law, although a little grey, requires anyone