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Some fungi are very poisonous so a mistaken ID could have serious consequences.
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How accurate do you think the colours were in the photo? Do you think it could have been a bit browner than this (in which case its a different species) or a bit pink/lilacer in whcih case it might have been the Lactarius lilacinus which I think is rather an unusual find.
I'd say the colours are pretty accurate. I've not seen one like this before so maybe it is a rare one?
Rare in Britain, found on soil in wet woodland where it is always associated with Alder. It does not appear to be near trees in your photo so I think it unlikely. How about Lepista? Although called Wood Blewit (Lepista nuda) it can be found in hedgerows / gardens etc.
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There are quite a lot of Alders on Dartmoor - they used to use it to make charcoal.. and for what it's worth this photo looks very much like the one in the Collins photographic guide!
I think its a Lactarius but perhaps not Lactarius lilacinus. I guess the trees might have been larch or similar from the bits of needle?
Lat/Lng: 50.572, -3.9211
OS grid ref: SX640764