The Morris Minor was built through 1972 actually, according to Wikipedia. And this photo looks to be newer that 1970, judging by the front end on the MGB to the left....
The rubber bumper MGB came out for 75, I think, so the picture is definitely newer than that. This one could well be a 70 Morris Minor. These were one of the last wagons to use wood, and I believe the last rear wheel drive wagons in normal production to use wood.
Looks like a recent photo to me. According to the DVLA the car was registered in 1971 and is currently taxed: The vehicle details for WWG 699K are : Date of Liability 01 09 2014 Date of First Registration 01 08 1971 Year of Manufacture 1971 Cylinder Capacity (cc) 1098cc CO₂ Emissions Not Available Fuel Type PETROL Export Marker N Vehicle Status Licence Not Due Vehicle Colour BLUE Vehicle Type Approval Not Available