A definite positive addition to any collection
Although like many British SF TV shows, the effects show the tight budgets, Gaiman's work comes through*. I videotaped it off of public TV a few years back, and was glad to finally see it on DVD. Fortunately, "Gormenghast" took much less time to make its way from BBC to DVD.
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*"Dr. Who" is no less of a classic for showing a few monster zippers, and the low budgets of early "Red Dwarf" episodes were no barrier to a great show either.