NONE, actually.
The UK government though did say tests carried out by the Defence Science and Technology Laboratory at Porton Down in Wiltshire concluded they had been exposed to a nerve agent. But no evidence has ever been presented to prove the alleged Russian connection.
Prime Minister Theresa May said the nerve agent had been identified as one of a group created in the Soviet Union and known as A-234, part of a group of agents known as Novichok.
Sergei Skripal, 66, and his daughter Yulia, 33, were found unconscious, slumped on a bench outside a branch of the Zizzi restaurant chain in Salisbury, a cathedral city in the west of England.