Looks like the sort of aftermarket dolly up done by Canopy Industries at that time. Maybe done for a dealer or a batch for BMC to tart up some excess stock.
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The Freeway was the last gasp for the old front engine rear wheel drive BMC Saloons. It came after BMC gave up on trying to sell the 1622cc four cylinder saloons to Australians. Next came the Austin 1800 which would have been a damn good car with another 50 horsepower and sold many more than they did. The Tasman and Kimberley had the East-West front wheel drive OHC six cylinder later used in the P76 in rear wheel drive form. A dog by any name.