They had policies which were clear to never target civilians the usual argument people make to say that they did target civilians are things like oh well look at bloody Friday, adequate warnings were given but the "security forces" were unable to cope and couldn't evacuate areas in time. The IRA set off a massive truck bomb in Manchester which could have killed hundreds of civilians but they gave a warning so nobody was killed.
I could make the same argument to say the American army targeted civilians if someone said to me the American army don't target civilians I could just say then why did they blow up a hospital in Afghanistan a few months ago? If someone said to me the British army didn't target civilians I could name things like Bloody Sunday, Springhill massacre, Ballymurphy massacre etc.
Terrorism is just a word used to describe something British people don't like, the American war of independence, the irish war of independence pretty much any country that ever fought against British rule were called terrorists.
If you want to disagree with me please check back on the comments of your answer I will quickly debunk your answer. The absolute cheek of the British labelling the IRA terrorists and murderers when 13 years prior they had held tens of thousands of innocent people in Kenya and tortured, mutilated and killed tens of thousands of them all to counter a group with 100 members who tried to gain independence.