Wooden lifting block for the Mini front subframe below as detailed in 1960’s BMC workshop manuals. It’s shaped to suit the angle of the front subframe cross-member and locates between the tie rod mountings. The front of the car can then be safely jacked up following the workshop manual’s instruction:-
"Lift the front end of the car with the jack positioned under the centre of the front cross-member and with a specially shaped wooden block interposed between the jack pad and the cross-member."