Yeah this had me confused aswell until I read wikipedia a bit more carefully. After 1971 in Australia, the lotus twin cam escort was renamed RS1600. I think the BDA engines came out of the AVO factory in South Essex and weren't featured in Australian models? Please correct me if I'm wrong
quote:
Wikipedia
The Mk I was produced by Ford Australia from 1970 to 1975 in 2 door sedan, 4 door sedan and 2 door panel van body styles. 1100 cc and 1300 cc engines were offered, as was the 1558 cc twin cam unit. The latter was offered only in the Escort Twin Cam model, which was renamed to Escort GT 1600 in late 1971
http://en.wikipedia.org/wiki/Ford_Escort_(Europe)