It will fund clean water, food packages, blankets, stoves, mattresses, counselling support and play areas for children.

There are 1.1 million Syrian refugees registered in Lebanon, equivalent to more than a quarter of Lebanon’s population.

On a visit to a Lebanese refugee camp, Cameron said: “As the second largest bilateral donor to the humanitarian crisis in Syria our aid effort is supporting thousands of people to rebuild their lives, providing protection, counselling and schooling, alongside the provision of basic food and water. Investment in health, education, jobs and stability is the most effective way to help people overseas, and it is clearly in Britain’s interests.

“Our goal remains to support the development of a secure, stable and peaceful Syria. Without our investment in international development, the numbers of people seeking to embark on a perilous journey to Europe would be far greater.”

Some £60m of the newly-announced British refugee funding will go to International Rescue Committee, World Food Programme and United Nations agencies to support thousands of displaced people in Syria. A further £6m will go to Jordan and £5m to Turkey to help the countries respond to the refugee crisis.

Cameron also announced the appointment of Richard Harrington as minister for Syrian refugees to ensure arrivals are resettled in the UK.

An additional £10m per year for the next three years has also been pledged by the UK to support thousands more free school places for Syrian refugees and vulnerable children in Lebanon. This comes as the UN warns that another million Syrians could flee their homes before the end of the year.