I believe the link in here is still current:
So:
- Add your card (not your bank account) to PayPal
- Visit the link in the thread above
- You should now be offered conversion options for each card on your account
- Make sure you select Bill me in the currency listed on the seller’s invoice. for each of your cards
- When you make a payment through PayPal just make sure they honour your choice: Balances and Amounts should be noted in EUR and EUR only. If they show GBP anywhere then they are about to rip you off
In my experience PayPal usually honours your choice, but it’s certainly good to be vigilant during the payment process to ensure they don’t sneakily convert to GBP somewhere…