It's about time!!
It's not a change!
Seriously, it isn't a change. There was (and still is and no doubt will continue to be) a habit of lying about the law in the media in order to make people scared, angry and nationalistic, but that's not reality. As far as I know, there has never been a time in the existence of the UK during which people were not allowed to use reasonable force in defence and with a lot of latitude regarding what is reasonable when attacked and especially in your own howm. Medieval English law allowed it. I'm pretty sure that Anglo-Saxon law allowed it as well.
The only people who object to the limits of the law are those who fantasise about torturing people to death and want to do it without any fear of being prosecuted for doing so. These are not people that a civilised society should want to pander to.