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Its around 44p per unit with an Elli (Drive Highway) sub - so in the same ballpark as if you were a non-Tesla driver and wanted to get better rates at Superchargers by getting a Tesla sub.
The Carlisle one has been active for a few weeks now, but strangely wasn't on the IONITY website/app until recently.
Good to see it finally opened though, across the road from my home with a handy Starbucks drive-thru too!