Jack
Thanks for the reply and info.
I am not too worried about what shade of blue I use but you are right, the hammer tone blue look great.
I think I will find somewhere on the mower, Rover dozer blade or trailer that still has the original blue in a reasonable condition and see if I can get a close match with a colour card of some sort. I can then get this cross matched with an auto paint.
Having just finished painting a car roof in metallic silver (the hardest part of a car to paint with the worst colour to spray) I am not expecting too much issue in painting a ride on mower.
No rush, I am just gathering info at this stage.
Cliff