The Department of Health is attempting to measure the extent of “social isolation” in the UK, after warnings that it has sparked spiralling levels of illnesses including heart disease, high blood pressure, dementia and depression.

Research has revealed that loneliness is a growing problem in the UK – particularly among the elderly – with one in three admitting that they sometimes feel lonely. Among older people, more than half live alone, 17 per cent are in contact with family, friends and neighbours less than once a week, and almost five million say the television is their main form of company.

However, the trend is expected to worsen in the coming years. The Office for National Statistics disclosed last year that the number of Britons living alone has risen to a record 7.6 million – one million more than in 1996 and amounting to almost one in three households.

But beyond the personal problems the “loneliness epidemic” presents, ministers have been put on alert over its wider impact – and financial costs. Loneliness is blamed for piling more pressure on to health and social care services, because it can increase the risk of complaints including heart disease and blood clots. Experts also believe it encourages people to exercise less and drink more – and ultimately go to hospital more often and move into residential care at an earlier stage.