I think the guy you need is Martyn K - although don't know whether he still looks in on the GMB.
For reasons I'm unaware of, Susan Tobin's book omits any images of these 'long tailed birds' - but there have been images posted here by Susan herself I seem to recall - about 9 months ago or something vaguely similar - and feel sure if you use the Search facility you'll find something. Most, if not all that I've seen, have some sort of speckled colourway - although looking at the darker blue band running through yours, it's very similar to one of the vase colourways which believe is decribed as 'blue/blue'.
Sorry, but can't really be of any help, but do try the search cos I'm sure there is some information available.