Ah found it:

It was Marco's creation from back in 2009! Though I'm not sure if anything ever came of the idea. (Build diary here: http://www.fightingrobots.co.uk/thre...w-heavy/page2?)
Could be an idea to look into using a single hydraulic ram to power a combined lifter grabber, I beleive Kenny is selling some hydraulic pumps in the for sale section though they be slightly underpowered for a heavy but I'm not sure