The idea they would just dump the agent without a care is also ridiculous. If this was a Kremlin hit on a Russian enemy, then you would imagine there would be strict orders from the top to not be fucking sloppy. Do you seriously think Putin would accept the risk of a nerve agent killing lots of British people on British soil? That would be very serious indeed, and not in Russia's best interests.

So no, they would not dump a perfume bottle in a bin. They would have a better plan.

It's interesting these guys aren't ill. They would surely have got noticed wearing hamzat suits outside the Skirpal's house. Funny no one saw that.