Update:
So Wife used the new superchargers (not on her car map) which I verified as being there, got her down to plymouth & beyond nicely (SR+ remember) with plenty of charge left for pottering about..
There are Superchargers at Lifton (not far from "Tavi" )
Exeter North & south..
Camborne ...all open to NON tesla BEVS on the map.
Both she & nipper visited eden centre & used the car park chargers (may is low season, so the 4 hour limit did not apply, verified in person) ..when I checked the car remotely it was on it's own as a BEV in a wilderness of tarmac, ..no worries.
It does concern me that once again with the internet being damnable down there, that eden centre insists on online bookings, especially for disability access & the likes.. today wife is off to see if a local coffee shop has useable internet to sort something listed & sold online that doubtless she now wants me to pack & despatch, ..having just had the recycling bin picked up ..snarls
Today, wife is going to the tv scenic (thank god you cannot smell the fish) Looe harbour for some crab to wean kiddo off crab flavoured surimi

where there are 2 chargers? in the car park area, a bit iffy apparantly but possible, suffice to say after eden charging not needed.
Low season, maybe the trick here is to pay for the 1 year pass, visit twice (half & half) if not down the lower end of the map. do not anticipate any charging problems with this arrangement, there is easy access to Eden-acres even when closed (so reports state, which makes sense as why block off chargers which take & make money)?
Only thing, cabin overheat does suck energy, wife ha not got any deflectors with her... something to bear in mind if off on a jaunt to Kernewek Brittonic language region(s)

..as it will only stress out the easily stressed further

..so. yeah, I "don't think" my wife will be regaling a fictional panic-ed second home with kids tale across numerous media platforms ..unless the money is right & she fancies being called out as a liar down the line!
Exeter is not a bad gateway location (16 bays)
Plymouth superchargers estimated by sept 2024, more "down sarf" power points, ..B-right-on still in a mire of uncertainty as to works in any shape or form!