Andy Hall wrote:
There is a photoelectric beam accessory that is normally intended to
protect children and animals. If there is something in its way, the
door opens.

If you put one of these in the right place, if the car is not far
enough forward, the door won't close.

B&Q have these for £25.

Tennis ball £1


Steve R

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One piece, one button suit, timeless fashion. All made by the same
manufacturer, no designer label, everybody has one.