在英国，将儿童单独留在车内并不违法。 In the UK, leaving a child alone in a car is not illegal.

英国政府没有专门的法律禁止将儿童留在车内无人看管，但如果这对儿童构成风险，则被视为犯罪。 The UK government doesn't have a specific law against leaving a child unattended in a car, but it's considered an offense if it poses a risk to the child. 决定什么构成风险取决于具体情况和孩子的成熟程度。 Deciding what constitutes risk depends on the situation and the child's maturity. 国家防止虐待儿童协会建议，婴儿、幼儿和幼儿永远不应无人看管，而 12 岁以下的儿童可能还不够成熟，无法长期处于无人看管的状态。 The National Society for the Prevention of Cruelty to Children advises that babies, toddlers, and very young children should never be left unattended, while children under 12 may not be mature enough for long periods of unsupervised time. 由于每个孩子的成熟程度不同，父母应该单独评估这些因素。 Parents should evaluate these factors individually, as the maturity of each child varies.