Brian, have a look
here at Norbar's document "The ten things you should know about your torque wrench". With your experience you will know that Norbar is an established and respected UK manufacturer of professional torque wrenches.
Scroll down to the heading:
"Using torque wrenches for undoing". Here, Norbar says:
"So long as users operate with caution and do not exceed the maximum torque, most torque wrenches can be used for undoing."
Simon