Amazingly I actually got a reply from Discovery Europe:

Dear Andy,

Thank you for contacting Discovery.

We have made some investigations and 'Mythbusters' would not appear to be featuring in our schedules in the immediate future. We regret any disappointment this may cause but feel free to contact us at a future date and we will investigate your enquiry again.

We hope that you will continue to enjoy watching our channel.

Kind Regards,

Discovery Networks Europe Viewer Relations Team

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Remind me to change my signature to something more interesting someday