Adding a bit more to this in case it helps.
If a coupon code is added the payment is correctly being pulled into PayPal in GBP.
But a couple of things with the coupon codes – I have tried to auto-apply the coupon code but this is not working
I created a coupon code which is for 5% but when you add the code the notice is saying – Congrats! 2.00 % discount will be applied.
New Price: £273.42 / Year
rather than 5%