Free Traffic Legal Advice

If you happen to get home electrcity from Octopus, then their Electroverse App works on plenty of chargers (over a million, but not all in the UK of course) and gives a small discount at some of the major suppliers.

No idea if it is open to non-customers of Octopus though.

In terms of route mapping and finding most chargers, I use ABRP (a better route planner).