I have also raised this topic on my local freecycle chat group (I am the founder of Solihull freecycle).
I am considering having an open few hours in my garden in a month or twos time, for people to meet up and pass on unwanted plants, seeds and other small items e.g. books, CDs. Will probably be on a Sunday.
If you would be interested in coming along, please reply below.
Becky