I've just been finding out a bit more. The car arrived in NZ in either 1926 or 1928 according to who you believe, and was subequently raced in its original 1100cc form. After WW2 it was hugely modified and I suppose the only M-T bit left was the frame. It was the Thomas Special, the Thomas-Mercury, the Acme, and the Ardun Special. I believe that it's car #29 in this photo.