"Katie and flowery. Will you be getting a couple of weeks off in the summer to enjoy your family? Nuff said."
What do you mean, "nuff said"? You are making an assumption but even if you were right how is that remotely relevant?
Most people do have a chunk of holiday in the summer. None of us has claimed otherwise. But just because most people get something doesn't mean it's a breach of your human rights that you don't get it as well.
There are thousands of businesses up and down the country who have their peak time in the summer and ban holiday completely during that time as a result. Do you really think there should be a law saying all businesses should ensure every single member of staff gets to take a chunk of time off during the summer? Seaside hotels? Tourist attractions?
If you'd posted saying that
a) your employer had imposed a blanket ban on holiday during the summer and
b) there was no business justification as peak time is winter, then I would have also been outraged on your behalf.
I still wouldn't have thought it worthy of a trip to Brussels or a constructive dismissal claim however if it were a change to terms and conditions I might have said you could fight it.
But a) there is no blanket ban. You just weren't quick enough booking your holiday, and
b) you confirm yourself that peak time is summer weekends.
It's very annoying, and especially so if you have children of school age. But you asked if it's illegal and the answer is no.
By all means go and check with an employment lawyer if you like, or for the human rights aspect go and have a chat with Amnesty and see if they will take time off from helping people imprisoned and tortured for their beliefs to help you with your holiday dilemma.
Sorry but your hysterical attitude is losing you a lot of sympathy points with me. And I wish you luck finding someone in AIBU who thinks this is a breach of your human rights.