There will no doubt be instances this year when Safety scrutineers will check for a manual means of operating the handbrake as opposed to the period fit total hydraulic handbrake system.
One modification has been to fit secondary cable systems to meet the requirement.
One well documented period method was to drill a hole through the transmission tunnel above the front propshaft u/j. A screwdriver can then be dropped through the hole and the u/j to form a mechanical means of stopping the rear wheels from turning. This unfortunately does not satisfy the MOT and means of testing so cables it is!