"He's very comfortable talking to people, especially adults. A lot of people say he's like a little old man." Inspired by the late Captain Sir Tom Moore's heroic efforts for the NHS, Zach raised £20,000 last summer by walking - minus his wheelchair for the first time - around the family garden. But when his 1.6-mile feat was publicised on Twitter, trolls bombarded it with strobes and multicoloured images designed to spark convulsions. Zach was not harmed but several epilepsy patients who saw them suffered fits. Campaigners want seizure-inducing messages to be recognised as a specific offence in the forthcoming Online Harms Bill.