Recharge Spanish Amena (Orange) PAYG SIM from UK?

Hi,

Trying to add some more credit to stop the existing credit expiring.

Have tried using www.orange.es with my credit card, but it doesn't seem to
be working at the mo.

In the old days (when they were Amena) I used to buy O2 vouchers and use
those (under the Starmap Alliance). Do these still work, or do I now need
Orange UK vouchers? And can I add the voucher from the website, as I seem to
have forgotten the key combination to do it from the phone.

Thanks,

Fred.