Gunnerkeld in Cumbria nearly suffered the same fate as Arbor Low, though there are a couple of stones left standing. I am not sure whether Gunnerkeld is a recumbent circle.
http://www.themodernantiquarian.com/browse.php?site_id=1688
I thought that Arbor Low is a recumbant sone circle badly damaged - the recumbant stone (when standing in its original position) usually closely matches the horizon in shape - that was my impression at least.
East Aquhorthies in Scotland is a good example of a recumbent stone circle
http://www.themodernantiquarian.com/browse.php?site_id=188
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