Mont Blanc shrinks a metre since last official measurement in 2017

French experts say the mountain has lost an average of 13 centimetres in height every year since 2001

French experts say they have measured Mont Blanc, the tallest mountain in western Europe, at almost a metre lower than its previous official height.

Geographical experts said that after an expedition in mid-September the mighty mountain in the heart of the French Alps was 4,807.81 metres (15,773.65ft) high, lower than their last published estimate of 4,808.72 metres (15,776.64ft ) in 2017.