Sounds like you have easy options for some common drugs. Not a bad thing perse and sounds like they didn't offer any opioids
If you ever see >1 person just standing around and not walking somewhere in London early in the morning just stay the fuck away from them. And if they start heading your way, run.
Got my car totalled on the m40 by a teen with a license of 6 months who was clearly on his phone - that one I was for sure lucky, could've easily been the end of me. The police? Didn't even show up. My police report that I filled out while still shaking got a response letter of "We don't care m8".