I tried the adaptor in Germany, Austria and Hungary - it fitted into sockets perfectly. However, as far as I remember some Italian sockets are different than in the countries mentioned above, so it might not work everywhere in Italy. This is good value for money, I got it for 89p with P&P.
This adaptor is simple, yet efficient. It doesn't seem to have a fuse in it, which is in my opinion rather an advantage than a disadvantage. An extra fuse would not be really an extra protection because the safety standards are the same in EU so it'd be only annoying: a small overcurrent and you cannot use the adaptor any more until the fuse is replaced. I had this kind of problem with another adaptor before - it was irritating. Luckily you won't have the fuse problem with this product.
One more word on safety: once you plug a UK plug with not blind safety ground on it into the adaptor (the longest pin is metal not plastic), it joins to European safety ground directly without any transmitter material, which is clever, safe and efficient.