Here are how it turned out after trial spraying. SWMBO reckons it is too "peppermint" and I should go for a darker colour.
I made the obvious error, of assuming that as every colour swatch i had seen on my computer looked the same, then that must be the colour. Yes, I know, I know .... now. I have sent off for a RAL colour fan. I think I need RAL 6011 and not RAL 6021. We shall see. Anyhow, no harm done.
But I will have to let Chris know if I change my mind on the colour as he is going to use the same colour in the gelcoat, when we get that far.