Re: @unwarranted irrelevance: In other words...
If you are doing something which is visible from the public highway then there is *nothing* that says that someone cannot take a photograph of you.
If they are on private land, then you are entitled to ask them to stop taking photographs and leave, but if you are not taking reasonable steps to preserve your privacy (cf the aforementioned "curtains") then you can complain all you like, but they are not breaking the law.
Yes, photographers should be reasonable in their actions, personally I dislike the Papparazzi using mega long lenses to take photos of "celebrities" on boats or from boats to the beach etc, but they are not committing an offence.
In any case, this is well away from the point, unless you think that the photographer was invading the privacy of the PoT!