WOOHOO! GOT IT!
I finally got the DVD of this remarkable film from Sands Films through Amazon UK. The film is region free but it is in PAL format, so you do need a DVD that can convert PAL to NTSC if you're watching it in the States on your TV -- although you can watch it on any computer. I went ahead and got a region free player that will convert for about $55.00 refurbished, and I'm happy with it. (Philips DVP5960) I did this because the next step is to buy The Norman Conquests from the UK because that's another one I had on inferior VHS tape for years and absolutely love, and I don't expect it to come to the US any time soon.
Anyway, celebration time! The original Little Dorrit is finally available! www.sandsfilms.co.uk