KHS carry out an annual schedule of verges maintenance and details of these can be found on the following link: http://www.kent.gov.uk/roads-and-travel/what-we-look-after/grass-cutting-and-verge-maintenance
It is assumed that the responsibility of overhanging vegetation onto footpaths and highways is down to Kent Highways (KHS) but frequently this is NOT the case. When a problem is reported to KHS they will ascertain ownership of the land and, if appropriate, write to the landowner accordingly. (Highways Act 1980, Section 154). The landowner is given 28 days to complete the necessary vegetation works. If the works are not completed within this time the KHS send out a warning letter and giving the owners a further 28 days to respond. If again, the landowner fails to complete the works then KHS will action them instead and bill the landowner accordingly.
Trees/shrubs are required to be at least 5.2m (17ft)above the edge of the highway and hedges/vegetation should have a 2.5m (8ft) high clearance at the back of a footway. Hedges/trees/vegetation should have a preferred safety clearance of 0.45m (1ft 6in) from the edge of the carriageway.
If you have any concerns or wish for further information on this please contact KHS on the details above