Jan - you can ask your District Councillor to contact Kent Highways and ask them to contact the owners of the offending front gardens and clear the over-growth; the owners will be given a short period in which to cut it back, after that time, KCC will do it and charge them and it will cost the owner a lot more than if they did it themselves.
The email address I use (and get replies from) is
kenthighwayservices@kent.gov.uk
If you'd like to email me the addresses of the offending properties, I'll write to them
Roger