Update: It has been pleasing to receive thanks from several Medway schools for this information. I think they are trying to tell me something!
You will find here KCC's Advice to Schools on possible initial effects for them in the event of a No Deal Brexit arriving on March 29th.
As one new to this aspect of the Brexit debate, I found the three diagrams at the foot of the table especially illuminating. These deal with the proposals to funnel, park, and stack lorries through Kent in the event of a No Deal Brexit.
It is not for me to comment on the content, but observe that it is entirely proper for KCC to consider possible negative effects and warn schools to prepare for them, given our position between Calais and the rest of the UK.