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Always remember to bring your outlet adapter! Your outlet adapter always a must have! I got the cheap ones from Target. They look like the picture below. They worked perfectly fine with my iPhone charger and my hair straightener. You don’t need the fancy schmancy ones! At least not for Ireland, England, and France. In Paris, the adapter did get a little warm so I wouldn’t leave anything plugged in more than you need to. It may have been that the hostel was old, but thought I’d just give you a warning anyway.
When I was in England, I did try to plug in my blow dryer, but because it was the larger plug it didn’t fit properly into my adapter. The problem was that it was too big a plug to also plug into the wall. Since it only fit one way, the end didn’t fit properly into my adapter. The problem was that it was too big a plug to also plug into the wall. Since it only fit one way, the end with the cord was up against the wall, making it impossible to plug in. I’d advise to try out your electronics and tools before traveling.