It reminds me a bit of the lovely mini submarine in the Tintin books "Secret of the Unicorn" or "Red Rackham's Treasure". On that subject on the last page of one Tintin book there is a lovely picture of a group of cars about to set off on a rally, and it includes a KR175 and a Velam Isetta.
Incidentally, today, Friday , UKTV History is showing the attempted assassination of Princess Ann, and a few minutes in there is stock footage of traffic in London which includes a shot in front of Buck house, and a blue and white Nobel drives by right to Left. Don't blink!