The heading says it all.
All the devices have the latest versions of firmware and software.
The slingbox is connected to the cable feed via composite video from a DVB-C Tuner, so the signal being send is not HD.
The iPad is quality is set to receive Auto. The iPad2 Slingplayer shows the TV just fine, so the feed from the Slingbox is fine.
I don't really see what is going wrong. This cable worked last time I used it (for something different). Though I submit it could be faulty, as could my TV. I will try and run some alternative devices to check the TV input is working. In the mean time, any suggestions?