The roundel is approximately the size of the white circle in your example. They also did not cover the MG hatch but took up most of the room on the roof above the driver when the hatch was fitted. Orders were they were not to be placed on any removeable area and the hatch is removeable as it shows the underside when open.
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"
