So far, no one has listed a source for the 150 foot-pound torque. As I mentioned earlier, the 7 th Issue of the Workshop Manual does not include any torque setting, and as Steve posted, there is none listed in the BJ7/BJ8 shop manual.
There is no way to attached the AH Spares spanner, or the wrench from Healey Surgeons, to a torque wrench.
Using a standard 2-3/16 socket, I was able to achieve 90 foot-pounds, which is 30 foot-pounds more than what is listed in my Workshop Manual for steel wheel lug nuts..