Birdsfoot trefoil as green manure

[caroline7758]

While browsing the premier seeds ebay pages, I found this.

http://cgi.ebay.co.uk/GREEN-MANURE-TREFOIL-BIRDS-FOOT-20GM-FINEST-SEEDS-/390233104966?pt=UK_HomeGarden_Garden_PlantsSeedsBulbs_JN&hash=item5adbb4a246

I've heard of lots of types of green manure, but not this one, so wondered if anyone has used it?

[caroline7758]

[Bugloss2009]

surely clovers and suchlike  are not good as green manures for home use? Tough roots and perennial? OK if you have your own plough