Your long-tailed bird is definitely from the Wedgwood Glass factory in King's Lynn. It is one of Ronald Stennett Willson's designs - RSW73. This design was made in sapphire blue, cream with brown speckles, white with brown speckles and yours, white with pink speckles. Depending on the finished quality it may not be etched. Seconds weren't but sometime in the past it had a sticker.
There is reference to the bird in the book, "Wedgwood Glass", but no photo. The book is available from enquire(AT)marg.co.uk (England) or whosaid99(AT)hotmail.com (in Australia).
Mod: email addresses protected from spam harvesters. Change (AT) to @ to make them work.
Enjoy your bird. With the long slender tail it's lucky to have survived undamaged.