I found the article. The author calls them Mutilated Kistaven, Fallen Kistaven and Devils Den Cromlech.
There is a sketch of the second which has 3 stones and a small mound.
The following year he found workmen breaking the stones up.
The mutilated one had all but disappeard into a pile of field clearance rubble.
I didn't note the authors name but will check next time I'm in the library.
PeteG

You could have just said you didn't know....
The reason I asked was I was wondering if you knew if they were excavated, or the stones were taken, or if they were ploughed out, i.e. whether it was worth me going to have a look. But it looks like you've answered that now, thanks.

Moth you should apologise to me and Jane for implying that Pete G and Octopussy are the only sensible ones here...