methanol

Symptoms of methanol poisoning are similar to a hangover, meaning it can be hard for a person to know if they have been affected.

Greta and Arno's deaths came just weeks after six people died of methanol poisoning in Laos, a country which neighbours Vietnam.

Calum is now working with the families of three other British people who died following methanol poisoning in South East Asia.

The family of a woman who died from suspected methanol poisoning while travelling in south-east Asia have succeeded in their campaign for compulsory education about the issue in schools.

In an interview with BBC South East, he said he was calling on the government to "increase the awareness among young people of a likelihood of methanol poisoning".