Belgian refugees on the harbour at Ostend waiting for a boat to take them to England, 1914. The United Kingdom was home to 250,000 Belgian refugees during World War One, the largest single influx of immigrants in the country's history. On 14th October 1914, 16,000 Belgian refugees arrived in Folkestone in a single day. From 'The Manchester Guardian: History of the War', Vol. I.-1914-15., 1915.