I do think they have the right to protest. I say that with a heavy heart.
I don't agree with them and I think many people's motives are not rooted in concern for unborn 'children'.
But I have protested and picketed and might do so in the future and I would not like that right to be withdrawn by an exclusion zone.
As posters have pointed out; they already exist and I don't want them to spread.
So reluctantly I'm going to have to extend it to them. But I don't want to give them an easy ride and there's plenty of legislation for the police to deal with it if they want.
I don't know how the police go about it in practice but I'd say that legislation covering trade union picketing is probably a start.
There are no more than six pickets. You do not block the entrance. You are allowed to engage people in conversation but not to harass.
After that, laws on public order should apply. If you alarm, harass and distress someone with word or deed, you should be arrested and possibly charged. I believe that clause is part of a Public Order Act passed in 1986 or thereabouts and was a reaction to NUM pickets upsetting the police during the Miners' Strike two years earlier.
At least one judge has dismissed a charge brought against protesters under that Act saying that the police are expected to be more robust.
But I expect judges to be a lot more sympathetic to people exercising their legal right to access a medical facility, especially at a vulnerable time.
I'd say the law might cover continued unwanted conversation, verbal abuse and display of distressing images.