We're going off topic here.
But, as far as I understand,passenger door mirror was a dealer option (not factory)up until the 1981 model year (September 1980)when it became standard fitment at the Solihull factory. So Dave you are correct in saying your Premium didn't have one fitted.
Okay back to TR7s on tv please.
TR7 Coupe KDU 366N
TR7 Sprint ARW 181S