If its the British government doing it, then I would say it would violate the right to protest. However, if the Olympic grounds are owned privately then it would be within the owner's rights to determine who does what within his grounds. I'm assuming its the former though.

I think they're enforcing the rules in the centre of London as well

I question why you were on the daily mail site, but otherwise to restrict something as simple as an item of clothing is simply showing us that this system is slowly getting into every aspect of our lives.

It was the first site that came up when i searched about it, but yeah you're totally right about it being the little things, ever heard of the snowball effect?