I'm slightly worried! I previously noticed this thread a few days ago and didn't know what to make if it, I'd forgotten about it until last night when we drove my visiting Mum home to Orpington, as we reversed the car onto her drive we notice 3 bottles of orange liquid carefully placed and pushed back into the bottom of her hedge. we all commented on them and it wasn't until we left that I remembered reading something on here about the same things happening locally. I am worried that they are a signal to indicate something like "elderly lady living alone" as my Mum lives alone and is nearly 80 years of age. I'm not sure what to do or whom to contact redarding this but can't ignore it either just incase. I haven't mention this to my Mum as not to worry her. This is too much of a coincidence.