Naomi, the politically correct stuff was always rubbish, but it does rebound on the people who follow it sometimes, and makes them look really silly.
One time, when my youngest lass was at primary school, a deaf girl came to visit the school. At break my daughter was signing to her in the playground and one of the teachers pounced, thinking my lass was taking the mick. The teacher didn't realise my girl knew a bit of sign language, and the deaf girl was completely confused ... the poor kid couldn't figure out why my daughter had been told off for speaking to her.
In the case of this report, well you don't really have to specifically mention homosexuality in most of the subjects as such ... you could ask why people move from the countryside to the city for example. Different family structures could be introduced in RE or social studies, especially as they are more appropriate for the issue of homosexuality, and the issue does come up in those classes anyway.
The chances are that the lesson plans will not be taken up by most schools, so it is a bit of a waste of time and money, but still small beer. The aim of raising awareness is laudable, and I don't have a problem with that, the reporting of it in the Telegraph and the Mail is sensationalist and, to my mind (well what there is of it) designed to raise the temperatures of some people.