There are issues, certainly, particularly in London, but let's not get it out of proportion as far as visitors to our country are concerned. There is a danger of painting far too bleak a picture. The advice given by some so far, to be polite and cooperate with the police if they approach you, is very sound and should prevent any real problem.
Whatever the wrongs or rights of Section 44 it is not for overseas visitors to make a stand, it is not their fight. It's up to us who live here to make a stand, if we feel strongly enough (and I do) and challenge this policy on the streets. I'm certainly not afraid of an altercation (peaceful, of course) with a police officer if it becomes necessary in order to defend my rights. There's very little they can do to you (except waste your time - and theirs) short of something that would enable you to sue them for megabucks. It's not like "Wind in the Willows" where Toad was sentenced to 19 years for "cheeking a policeman."
And that's the whole point - we
can resist and protest if we wish, because we
are still a free country and a democracy. I wouldn't fancy considering similar action in China, for example! O.K., we're a little less free than we used to be and that's why it is so important that we make a stand while we are still able. But this is a fight for us to win and not for overseas visitors to become involved in. So, tell your partner not to be alarmed if she is approached by a police officer whilst taking photographs, it really is just routine. She'll be absolutely fine if she remains polite and cooperative. I hope she has a wonderful trip.