On the contrary it is a public place, the sign admits that. 'Access is permitted...

callamdelaney 10 months ago | parent | context | favorite | on: New signs appear to ban phones from Temple Quay

On the contrary it is a public place, the sign admits that. 'Access is permitted by the owner' - there is not a right of privacy or expectation of privacy in this place, so it's legal to take whatever photo's you like.