Hello.
Much nicer photographs. I agree, the colours are similar, but I would still say that it's not Holmegaard, I'm afraid.
I'm happy to be wrong, and I frequently am, but I suspect not in this case. I own around 300 pieces of Holmegaard, probably nearly half of that being tableware, and I've handled/studied hundreds more, but I've still not come across any pitchers in this shape, size or thickness of glass. Nothing remotely similar appears in the original factory pricelists/catalogues I have either (although, admittedly, they're FAR from complete).
But even if it is Polish you've still got a pretty decent lump of decorative glass for your £15, so it's not all bad news.

And there genuinely is nothing wrong with Polish glass - except for its resale value. I used to collect lots of crazy-shaped Polish pitchers when I first started in glass, and they're incredibly fun.