Sorry about that, I should have checked the debug code and made sure it was using the proper UK values. The debugging code that you did add seems to be giving you the cvv error directly from PayPal.
Have you tried this with any other credit card? The code that is used to process the transaction from PayPal does not set these error messages directly, it just gets the full response from the PayPal API and parses it for the error messages. So it is PayPal that is telling you the values are bad. If you could test this with another card it might help to determine if this is an issue always with the current setup or if the error is specific to the card you are testing with.
If PayPal does not like the cvv value you are using for that card you would need to contact them for clarification.
