The reason I suspect this might be a misprice is because these are next cheapest:
The Hut £11.85
The success of the Walt Disney film Treasure Island, with Robert Newton starring as Long John Silver, soon had calls for further adventures featuring the famous pirate. Newton duly obliged, starring in Long John Silver and then this classic television series. Whilst Long John Silver has been portrayed by many actors, no one did it with the same kind of swash-buckling panache that Robert Newton managed.
Straight out of the book 'Treasure Island' comes the character known as Long John Silver. Join him in his serial debut. Also includes: 'The Necklace', 'Pieces of Eight', 'The Orphan's Christmas', 'The Execution Dock', 'The Eviction', 'The Pink Pearl', 'The Tale Of The Tooth', 'Ship Of The Dead', 'Sword Of Vengeance', 'Turnabout', 'Miss Purity's Birthday', 'Dead Reckoning', ' Devil's Stew' and 'Dragon Slayer'.