His Coldest Winter — Derek Beaven

On Boxing Day 1962 it began to snow. Over the next two months England froze. It was the coldest winter since 1740. The sea iced over. Cars could be driven across the Thames.
Riding home from London in that first snowfall, on the powerful motorbike he was given for Christmas, 17-year-old Alan Rae has a brush with death. Immediately he meets a girl, Cynthia, who will change his life. But someone else is equally preoccupied with her: Geoffrey, a young scientist who works with Alan's father in the race with the Americans and the Russians to develop the microchip. Alan, Geoffrey and Cynthia become linked by a web of secrets which, while the country remains in icy suspension, threatens everything they ever trusted.