Yeah, I've always been under the impression that Ford invented the heated screen and had it patented. Fitting them to their cars, in America anyway, since mid eighties. Then started fitting them to LR's when they bought LR in 2000. I've obviously misinterpreted that though, cos your D1 will be pre 2000? The patent since ran out and others have since made their own.Although I know from experience that ford liked fitting heated screens in their cars a long time ago (my and my mates sierra cosworths had them among others) I have come across 300/v8 d1's with them but I do believe they were largely an optional extra