Equal opportunities is not about treating everyone the same, it is about treating everyone in a way that allows them the potential to have the same outcome as everyone else. So if you have someone who does not need support and you give them the keys to a flar, then they have a flat. If you have someone who needs support and you give them the keys to a flat, then although you have treated them the same, you have not ensured equality of opportunity. To do that, you may have to help them with furnishing, perhaps with bill paying, etc. Because in that case, the 'opportunity' is to live in a flat.
In this case, the 'opportunity' is to go to Butlins. fine. Someone who supports them makes the booking. They would be supported in terms of transport, good. They make have support to pack, etc. The opportunity is to go to Butlins. The equality is to be supported to ensure that they can go to butlins.
However, what they wanted was to be allowed to go in a larger group than anyone else is allowed to go in. That is not creating equality of opportunity. Because that is not having support or making changes to the way things are done in order to do whatever is needed to allow someone with additional needs to have the same outcome as anyone else. They wanted a different outcome. They wanted a large group, far larger than anyone else allows. In short, they wanted the rules bent, the rules changed, they wanted to be treated differently due to their special needs.
I don't think that is right. My children have disabilities. I don't want them or people supporting them to demand that people change rules because they're disabled, if it's not about ensuring that they have access to the same outcome as anyone else, but about ensuring that they are removed from the mainstream and giving a whole different set of rules. I think that is a horrible way to treat people with disabilities, personally. Oh, you poor little disabled person, of course you can have things just the way you like . I can't speak for anyone else, of course, but I wouldn't want that sort of patronising attitude for my children.