Tesla have opened 42 of their sites to other makes, you need to use their own app to get them to work, they don’t work with any third party cards or apps like Elli or Bonnet.
Glos Guy is right, there is no point plugging in at a rapid charger, the cost (unless you get a massive discount) far outweighs the cost of putting fuel in, at 79p per kw you are achieving the equivalent of 36mpg, better to refill the petrol tank, keep it in hybrid mode and get your already seen high 50’s mpg. Generally PHEVS don’t really make a lot of sense unless you can plug in at home.
In life, it's not who you know that's important, it's how your wife found out.