Doctor Who: Planet Of The Spiders

At a Tibetan retreat in the English countryside, a group of men are using ancient meditation rituals to tap into a mysterious alien power. They unwittingly create a bridgehead between Earth and Metebelis 3, a planet where the 'Two Legs' are oppressed by giant spiders. The creatures are desperate to recover the blue jewel that the Doctor gave to Jo Grant as a wedding gift.

Now the Doctor must risk everything and return to Metebelis 3 to face the awesome power of The Great One, who plans to use the crystal to enslave all of human kind...

thanks for all the great doctor who scans, you've filled a bunch of gaps. don't suppose you can help out with any of my still missing ones:

Myths and Legends (The Time Monster, Underworld & The Horns of Nimon)
Kamelion Tales (The King's Demons / Planet of Fire)
Revenge of the Cybermen / Silver Nemesis
Time and the Rani

cheers