We stay around the Penzance / St Ives area, there’s a rapid charger at the new St Erth train station / interchange that’s been faulty for months. A town the size of Penzance only seems to have 7 kw supermarket chargers. Can you imagine what it’s like in August. Don’t get me wrong, I’m a green at heart, I really want to go electric. But it needs to be practical.
If it was me, I’d charge at Cornwall service on the way in, then if charging where your staying isn’t an option, use the supermarket chargers to boost that when you can. As long as you have enough to get back to (just beyond) Indian Queens on the way out, you’re sorted. Charge again at Cornwall Services and then again on the motorway. It’s a bit of a pain but resolves a lot of the worry. Also note some attractions are having/have chargers in place so you can visit, say, the Eden Project for a good few hours and top up whilst there.
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I'll try to give my honest opinion but am always open to learning.
Mark