So the 101 does seem to relate to 101 years after the Aero was made in 1920. Perhaps this will be named the 'Aero'.
Quote from: https://www.morgan-motor.com/announcement/aero/ Another special Morgan, inspired by Capt. Albert Ball’s specially bodied Grand Prix car, was introduced in 1920. This was called the Aero in recognition of the famous aviator.