After a volatile upbringing, Liam Meredith was 18 when he went to prison for drug-related offences. Behind bars, he was introduced to rehabilitation charity Key4Life, which helped him find employment and then go on to start his own food truck business. Here, he tells that story in full – before Sarah Mead, his mentor at food company Yeo Valley, explains why more businesses need to get involved and support Key4Life.