I live in deepest Cornwall. I drove from home to Kent in May and decided to go as far as possible before needing to charge, just to see where I’d get. I stopped in Exeter services as usual but didn’t charge, next stop was Fleet Services in north Hampshire, at the other end of the A303. That was 243 miles and I had 30 odd miles remaining on the guessometer.
I very much doubt you’ll have range issues in a car that can cruise at 70 for 3 hours. Remember with the 800volt architecture the Ioniq charges in half the time, so turn up near empty and you’ll be much nearer to full than you’d think in the time it takes to wonder into the services and have a pee, pick up a coffee and wonder back to the car, so even if you’re in a relative hurry, you should be able to boost the car in 15-20 miles.
Regardless of where you start your journey with over 200 miles range, it’ll be a deliberate effort to run out of juice.
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Mark