It's a double edged sword. Buy in the local hydro with cash, no trail to your door. However, the police do float around these shops, don't know about watching them for hours to see who is going in and out. If I go there I am a little cautious and do a drive by to look at cars parked around and near the shop. I also park away from it and keep my eyes open when I am walking up.
Order online, which I have, and the is a paper trail and bank statements with transactions on them. That could paint a picture.
I would suggest the police are not interested in finding someone who is growing a personal stash as the time, money and resources required are substantial each time and with the results a personal grow would yeild them the money would be better spent on targeting large commercial grows, putting a stop to criminal gangs.
I have also seen a few police chiefs in the UK already, Durham's for example, say they are not interested in small personal grows because of the waste time, money and resources.
The UK could really do with legalisation of cannabis right now, what a cash injection and job creator.
EP3