Hi JPD, I found that Dulux P38H9 (magnetic blue) was the best match for the Whirlwind blue. I have some left over you can have if you want.
Mate, Thanks very much for the lead and I'll give that a shot as well. I'll ask my local freindly Bunnings to mix me up a sample pot so thanks very much for the offer but my store is only just down the road.