Im in Kent.
there aren’t many, but the good ones:
1. Maidstone M20 - 6 - V3 chargers. You’ll be lucky to get a space here, likely to be waiting 10 mins for a space.
2. M2 J4 Medway Services. Brand new V3 chargers. 12 stalls - really good services, can easily get space to Dover and To London.
3. 150KW rapid chargers on A299 (a few miles past the Dover junction)
4. There are a set of rapid chargers going in at Dover, however not certain of location (people above have helped!)
I would recommend to stop at the above and fully charge to 100%. Depending on how much you’re driving around the area, might see you through to come back and top up.
Hope that helps!