I have had this response to the petition:

Thank you for submitting your petition relating to the use of Glyphosate on streets in Thanet, Kent .  The next step, in line with our petition scheme is for your petition to be considered by the Thanet Joint Transportation Board (JTB).   An officer from Thanet District Council will be in touch with you regarding meeting dates and arrangements but I can see from Thanet’s website the future JTB meeting dates are:  Browse meetings - Joint Transportation Board - Thanet

Following the discussion of your petition at the JTB a response will be sent directly to you from the KCC Cabinet Member.