Just had a look at TME #15, and according to Watto, one of the 19 changes from the Mini S to the SS was a centre roof mounted radio aerial.
It looks as thought this change was carried through to the LS as well, so still does not solve the mystery of the car in question, but it is fun to discuss!!!

_________________
It's not the size of the dog in the fight, but the size of the fight in the dog!!
1976 Mini SS
1971 Mini Ute (Custom) - really hubby's but I will claim half

1976 Mini SS Shell
Oh and an 850 shell waiting for our dear son to start his resto!