Did Theresa May really consider a cyber attack on Russia?

Who was the bright spark who put cyber warfare on the UK prime minister's list of retaliatory responses to Russia's suspected nerve agent attack in Salisbury? Britain is supposed to be a responsible and moral and lawful member of the international community. You can't go around launching cyber attacks even if the provocation from Moscow is undeniable. A cyber attack on the Kremlin would probably have led to a swift and devastating cyber attack from Putin's boys. Then where would we be? A digital war with Russia? Someone in Whitehall whispered to the newspapers that a cyber attack was a possible punishment being considered. So every front page thundered with the news. I doubt it scared Moscow but I thought it was foolish anyway. Once you start down that road suddenly every government turns to cyber warfare instead of measured responses. I assume Theresa May was happy to let the papers speculate about cyber warfare but then went for the obvious option - kicking out Russian spies posing as diplomats in London. She has selected 23 for some reason. In 1971, Edward Heath expelled 105 Russian spies from London. This was because MI5 had told the government that the then Soviet embassy was so stuffed with spies they were falling over each other. Now that really told Moscow. Mrs M may have to be a bit tougher than just expelling 23. But no cyber warfare please.