The day after I ordered the car I wandered over to the village charger (which is outside the church) after the church service. There was a big silver car with DK plates up almost finished charging and I had a chat with the driver. He told me to get a CPS card, although not having an address in Scotland he couldn't have one (I saw him using his bank card). So I did.
I've used it at least a dozen times on that charger, first just to practise, and then when I realised it was cheaper than my home electricity, to get up to ~90% fast then finish to 100% on the granny charger. I've also used the card at a type 2 charger in a car park in Glasgow while I went to the theatre, and on a free charger at Dawyck Botanic Gardens (free electricity, but by the time you've had lunch and paid for entry to the gardens, and been round the plant sale and the gift shop, not exactly a massive saving!) It lives in that wee net pocket in the centre console, and it's a motoring essential.
The guy with the DK plates was very reassuring, saying he drove between Denmark and central Scotland regularly and never had any trouble with charging. (And no, I don't think it was a Tesla.)