Because of all the white in the leaf and it being one that has been circulated in later years I thought of 'Oridono-nishiki' also. However the twig color of this tree seems darker than usual for that cultivar.

I was thinking Okukuji nishiki but mine has a green twig color.

That's what is confusing me, I thought Orido Nishiki but there is no apparent pinkness in the leaves, however it appears not to be grafted so it may be derived from the Orido Nishiki but has not carried that through from the parent trees, I may just have to settle for the fact that it is going to look stunning as it matures and be happy with that. Many thanks for your input if I do get a definitive answer then I will repost. Time to get on with my new found obsession with Acers :)

'Orido Nishiki' loses it's pink variegation in the summer. My 'Orido Nishiki' has recently lost all of the pink variegation and now all the leaves are only white.

Just checked out the Okukuji nishiki David and the colouring is spot on but the leaf shape on mine has shorter fingers and as you say the twig colour differs.

If it is NOT grafted, then most probably seed grown and therefore is just a variegated form of the species......it won't have (and can't have) a cultivar name, which is why it may have been sold untagged. And why it differs in some respects from the grafted named forms.

Yes I did think about that but it is not the sort of nursery that cultivates plants, they buy everything in from probably a dutch importer so would most likely either be grafted or propagated from cuttings, I think the label had just been misplaced as all other specimens had labels, they assumed that it was Butterfly because they had labelled larger plants and smaller plants of that cultivar but they were definitely different, it may have come from a previous shipment and indeed be an Orido Nishiki, I think they tend to buy what's available as opposed to specific orders, I'm not bothered either way I am just curious as to its type as I could not see a true likeness online.

"'Orido Nishiki' loses it's pink variegation in the summer. My 'Orido
Nishiki' has recently lost all of the pink variegation and now all the
leaves are only white."

Well, some do.

I have one Orido Nishiki that has completely reverted to green, one green and white, and one as perfect a combination of green, pink, and white as you could ever want. The one with the best color is in all day dappled light, the others in less perfect conditions.

They vary.

A lot.

Closer inspection shows that there is the faintest of pink colouration to some of the leaves and the main stem is a mixture of green, red and hues of pink which from other images on the net seem to confirm that it is indeed an Orido Nishiki, many thanks guys for all your assistance.

Pretty!