I have the old Imai issue of the London taxi and also thought the model looks bigger than 1/24 scale. I found the dimensions, below, on Google. At 25.4mm/inch the wheel base in 1/24 should be 117mm, width 72.5mm and height 73.5mm. I measured my model and the wheel base is 117mm, width 75mm and height 75mm. It does then to appear to be very close to 1/24 scale.