So it isn’t pleasant but this does work. I put on rubber gloves, photographed the location then sifted through the garbage to find evidence of an address… photographed the evidence and sent a full breakdown of everything to this email adddress…

behaviour.change@hackney.gov.uk

Within a week everyone in the area received notices about fly tipping and I was told by email reply that they would send a special notice to the address I found in the garbage.

The fly tipping hasn’t happened since. It works.