This is the largest, 1:30 scale, by Kinsmart. This model has sliding doors. Colours: Green; Blue; Yellow
Next one down is a 1:43 scale, (Dinky size) by Norev. Colours: black; blue; yellow; maroon. There is also an RC version in black (see picture above)
According to the 2005 UK catalogue, there was an even smaller size, called an "action model". Colours appear to be: red; green; black; blue; yellow; orange
Although the three smaller sizes were mentioned in the 2005 UK catalogue, there are no part numbers. The catalogue blurb:
"Can't bear to leave your 1007 behind? Keep it with you at home or in the office with one of these irresistible, authentic, 1/43 scale collectibles in either yellow or black. Also available as 3 inch models in four colours, or action models in a choice of six colours"
I've not seen any "action models" which seem to be even smaller than the 1/64 models in the picture.