Thanks, it was the brand names of Noch and Henki I needed - the rest I know, especially prices! I often make my own 'long grass' and scrub type materials, the old fashioned way, by using sizel string, unravelled Scotch brite pads, wire wool etc, but sometimes the 'ready made' stuff fills a gap. Seeing a photo in a catalogue or on screen is no substitute for knowing what it actually looks like in real life, and my LHS does stock some grass and ground cover materials, but not all, hence the need to go 'on line' sometimes.
Somewhere here on the forum is Part One of a Diorama Guide I wrote and posted some time ago - but I haven't got around to writing and illustrating Part Two yet !!