tariffs from today. i'm nuala mcgovern in london. also in the programme: police investigating the latest novichok poisoning case in britain say the victims probably picked up something used in the attack on sergei skripal four months ago. it is completely unacceptable for our people to be either deliberate or accidental targets, or for our streets, parks, towns to be dumping grounds for poison. and we'll hear from this exhausted—looking man here — he's just become the first person to kayak solo across the tasman sea. live from our studios in singapore and london, this is bbc world news. it's newsday. good morning. it's 8am in singapore, 1am in london and 7am in chiang rai, in northern thailand, where the authorities are in a race