Large parts of the United Kingdom are facing a cold health alert on Christmas Day as a sharp drop in temperatures brings wintry conditions, icy roads and heightened health risks.

Forecasters say the festive period is being marked by cold air moving south across the country, prompting official warnings aimed at protecting vulnerable groups and easing pressure on health and social care services.

The alert covers several regions of England and reflects concerns that prolonged exposure to low temperatures could increase the risk of respiratory and cardiovascular illnesses, particularly among older people and those with existing health conditions.

Night-time temperatures are expected to fall close to or below freezing in some areas, with frost and patches of ice likely to develop on untreated surfaces during the early morning and evening hours.

Meteorologists report that the cold snap is being driven by northerly and north-easterly airflows, bringing clearer skies but sharper chills.

While some areas may see dry and bright conditions during the day, the cold is expected to persist, with limited relief from daytime sunshine.

Authorities have urged people to check on neighbours, ensure homes are adequately heated and take extra care when travelling, especially on rural roads.

Transport operators have warned of possible localised disruption, while health officials stress that preventative measures taken during cold spells can significantly reduce hospital admissions.

The cold health alert is expected to remain in place through the holiday period as conditions are monitored closely in the days ahead.