The UK faces a potential surge in measles cases due to declining vaccine uptake, with unvaccinated children likely to contract the virus during summer trips abroad, particularly to European countries experiencing outbreaks. Over 17% of children in England have not received the two-dose MMR vaccine, a figure rising to nearly 28% in London, which has reported almost half of the recent cases. Health officials emphasize the importance of vaccination to prevent complications from measles, which is highly contagious and can lead to severe health issues in unprotected individuals.