There was no economic collapse of the currency in the UK after WWI.
There was a degree of inflation in France.
Germany experienced hyperinflation around 1923, five years after the Armistice.
Hungary had rhe worst hyperinflation of all after WII:
Hungary, 1945–46
Main article: Hungarian peng? hyperinflation
Hungary went through the worst inflation ever recorded between the end of 1945 and July 1946. In 1944, the highest denomination was 1,000 peng?. By the end of 1945, it was 10,000,000 peng?. The highest denomination in mid-1946 was 100,000,000,000,000,000,000 peng?. A special currency the adópeng? – or tax peng? – was created for tax and postal payments.[23] The value of the adópeng? was adjusted each day, by radio announcement. On 1 January 1946 one adópeng? equaled one peng?. By late July, one adópeng? equaled 2,000,000,000,000,000,000,000 or 2×1021 peng?. When the peng? was replaced in August 1946 by the forint, the total value of all Hungarian banknotes in circulation amounted to 1/1,000 of one US dollar.[24] It is the most severe known incident of inflation recorded, peaking at 1.3 × 1016 percent per month (prices double every 15 hours).[25] The overall impact of hyperinflation: On 18 August 1946, 400,000,000,000,000,000,000,000,000,000 or 4×1029 (four hundred octillion (short scale)) peng? became 1 forint.