How We Used to Live
For either bike, depending which is easier/more interesting. The black one is onscreen in several shots, but this is only view. The bike in the left background is a 1957 or later Triumph - from the 'mouth organ' tank badge. It has a 'pre unit' engine so could be a 1959 Thunderbird because that year's model was in dark colours. Do we want these as "Thunderbird [6T]" or "6T Thunderbird"?? We have both formats running, with a lonely 6T Saint in there as well. I would go with Thunderbird as model name and 6T as 'chassis'. I just searched a few '6T Thunderbirds' and this one - /vehicle_801902-Triumph-6T-Thunderbird.html - which is quite recent, I wonder how it can be distinguished from a Speed Twin. All that batch now changed to Thunderbird [6T], so we have a single referencing.
Reused from /vehicle_1003016-Triumph.html
148 NMK is a mid 62 plate, DMT 34A Sept 63 onwards. Reused from /vehicle_728743-Honda-Super-Cub-1963.html where