as a lawyer...i dont know what the law is - no-one knows it.....my job is to identify issues. The only law u need to know regarding cannabis is that it is illegal to grow it.

2 lads, Mo and Billy go to the shops. Mohammed walks out of the shop with super high strength fertilizer and a big smile on his face. Billy walks out of the shop with 10 cannabis seeds and a big smile on his face.

Both have bought products that are lawfullly availabe in the UK.

Billy is smiling cos he plans on growing cannabis
Mo (short for Mohammed) is smiling, cos he is going to make a bomb out of the fertilizer

Both ppl intend on using lawfully purchased products for illegal purposes. This is a crime. But how do u prove it?

Unless either of them walk into a police station and confess.....u cant prove nothing