We've received a bug report where a Maestro cardholder was unable to make a direct payment. If anyone else has a similar problem, please let us know by emailing our webmaster at josh@thousandbookchallenge.com, including the text of the error message.

Until we can trace the fault, the only workarounds are to either use another card or transfer funds to your PayPal account. Apologies for any inconvenience.