While on the subject of the wheel drop I have enlarged a view of the wheel drop shelter taken from inside the shed. I am intrigued to know what was the purpose of the 'cupboard' doors at the based of the side wall. Another photo in my possession suggests their were similar 'cupboards' on the other side of the shelter.

They could of course be for storage but maybe they gave access to the 'hydraulics' of the wheel drop. Ideas anyone?