'Guide to Prehistoric England' by Nicholas Thomas is quite an old book (mine's a 1977 reprint), but it is useful for site info. Here's an excerpt on Five Wells:
"An oval barrow, 70 x 65 ft., covers 2 separate burial chambers set back-to-back, each approached by a passage, one from the E, the other from the W. Like all the burial chambers in the Peak these are wedge-shaped, with 2 pillar-like stones defining the break between chamber and passage. Originally both structures would have had roof slabs and the whole covered with a mound. The passage-entrances are simply sharp breaks in the line of the well-built drystone wall which revetted the mound.
At least 12 burials have been found in the chambers, together with a fragment of doubtful early Neolithic and some Peterborough pottery and flint tools. This type of circular mound with chambers approached by passages represents mixed architectural and cultural elements: their derivation is western, perhaps partly Irish. They must belong to the period 2,500 - 2,000 BC."
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