Good grief! Planemike, Dayglo orange must have been an afterthought.
Back in the 1950s there wasn't any dayglo paint for painting on vehicles and aeroplanes!
Back then even the police cars were black Wolesleys with bells on the front.
Someone must have re-painted it. I think it was Primrose Yellow with a black stripe.
So it looks like it's down to memory for this, after all most of us in the late1950s and very early 60s were only doing black and white photography until Kodachrome transparencies came along with 35mm. I doubt if any colour prints exist from that era.
Anyhow it's all very interesting what you've all come up with on this.
G-AHFK did indeed go to Kenya but I had heard that it rotted away out there once it fell out of use. Rather sad really.
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Plado