2Entertain, who produce the classic series DVDs have announced that a batch of discs from their latest release, The Invisible Enemy, part of the K9-Tales box set, have an error on the disc.
The fault causes the disc to skip towards the end of the third episode.
If you have recently purchased the set and are affected, 2Entertain recommend emailing dvd.support@bbc.co.uk or calling 020 7612 3186. Instructions on what to do are on the auto reply from the email and on the voicemail of the phone line.
2Entertain apologise for this error.