Merlin managed five seasons and no movies before the BBC decided to call it a day and close down production. There was some talk of a spin-off, but that’s now dried up and, really, Merlin is complete.

If you like a film, chances are you might get the DVD. If you love a film, you may end up getting the Blu-ray, the special collector’s edition, the director’s cut, the collectible bust and even the ...