hi colin to answer your last sentence "it does" !!!!
what im getting at here is that you mention how good this album sounds after 20 years and how good it will sound in another 20.well in 2011 this album is now 40 years old !
quite worrying isnt it.all my faves from the early 70s like sabbath ,purple,yes,zep etc,etc are all now around the 40 year mark.
remember when you were younger and a record came on the radio/ from the 40s or 50s how old did they seem my god its now happening to our music,but somehow the album music of the great era(66-76)still sounds good only the production values seem dated(only in a few instances anyway)but with good remastering as these uriah heep cds have been,the music still sounds fresh and relevant.