Not claiming to be an expert, but...
Leggo Dub was pretty rare, tho reissued on CD on Hot Pot a few years back. Was this a Steve Barrow label?http://dublp.roots-archives.com/leggo.html
And I've never seen any other copies of Sly & Robbie's Disco Dub LP apart from the one I have.http://dublp.roots-archives.com/discodub.html
Decent album, but with one dynamite long dub, Sidewalk Doctor, a version of the Temptations hit written by Smokey Robinson.