A hospital vessel costing $178m at China’s Tianjin Xingang Shipbuilding Heavy Industry represents the latest realisation of a “dream that was impossible, improbable, unbelievable”.

That dream became reality after Don Stephens met Mother Teresa in Calcutta and went on to found Mercy Ships jointly with his wife, Deyon, in 1978.

Visiting London to celebrate the organisation’s 40th anniversary, Stephens discussed details of the hospital charity's first custom-designed ship, the Global Mercy, recognising the role of companies such as Stena