One of the co-designers of a machine later recognised as the world's oldest working digital computer has died.
Richard "Dick" Barnes helped to create the Harwell Dekatron, which was first put to use in 1951 by Britain's fledgling nuclear research establishment.
He was also involved in the 2.5-tonne machine's restoration, which saw it switched back on in 2012.
Mr Barnes died aged 98 on 8 April, The National Museum of Computing said.
