A 4-disc boxset featuring 3 three classic Doctor Who Stories: The Silurians, The Sea Devils and Warriors of the Deep. Next nearest price is £29.98 at amazon.
They also have a number of recent release titles at only £6.99, including The War Machines, Brain of Morbius, Invasion of Time, Time Meddler and The Time Warrior.
You can also get the Bred for War boxset for just £17.99 and that includes the four classic series Sontaran stories: The Time Warrior, The Sontaran Experiment, The Invasion of Time and The Two Doctors. Next nearest price £27.99.
Don't forget quidco!