The introduction of the Euro was also quite interesting. A lot of my friends in Ireland (not my home country, but I was engaged to someone from there at the time) blamed the switch for price gouging, but there is little evidence that any of this happened and certainly in places like France and Germany there were very strictly enforced rules about conversions.
What actually happened was three things.
First, in places with a culture of tax avoidance lots of people had mountains of legacy banknotes in drachma, lira, pesetas and escudos all stuffed in mattresses. Because they could hardly walk into a bank and change €50,000 of old currency in cash into euros without raising serious questions, they went on a buying spree: new kitchens, airconditioners, Mercedes-Benzes and the like paid for with suitcases of banknotes. This was inflationary.
Second, as part of the convergence criteria interest rates across the would-be eurozone had to be closely aligned in economies that frankly weren't ready for it. So interest rates in some (mainly southern) Eurozone countries were held artificially low for their economies, often in places with little experience of consumer credit, which was also inflationary.
Third, as some of the unintended consequences began to emerge the euro itself started to fall against a basket of currencies at a time when sterling was relatively strong. By late 2005, £1 bought €1.47 as against the €1.15 you'd get today. This meant that imports to the UK from the eurozone were particularly cheap, even as prices were rising in Europe. That pushed fresh food prices down in sterling terms at a time when the Common Agricultural Policy and a benign climate was also producing large surpluses anyway.