There are reasons why Theresa May might harbour doubts about the Hinkley Point nuclear project — chiefly its unproven French technology and the high probability of time and cost overruns — but the fear expressed by her aide Nick Timothy that ‘the Chinese could use their role to build weaknesses into computer systems which will allow them to shut down Britain’s energy production at will’ sounds — even to a Sino-cynic like me — far-fetched.