Stay up to date with notifications from The Independent Notifications can be managed in browser preferences. All News Sport Culture Lifestyle Planes queue for take off at London Gatwick Airport in Crawley, West Sussex (PA Archive) The UK government is introducing measures to protect British families' summer holidays amid a significant rise in jet fuel costs, which have approximately doubled since the Iran war. Ministers will relax 'use it or lose it' flight slot rules, enabling airlines to cancel less popular routes, such as business flights, without incurring penalties. This initiative aims to reduce overall demand for aviation fuel and prevent last-minute cancellations of holiday flights, offering greater certainty for travellers. Transport Secretary Heidi Alexander confirmed the government is proactively preparing to mitigate the impact of the Middle East situation on the UK, despite no immediate supply issues.…