United Kingdom is probably best but England is probably just as good.
If the location in the UK is not in England, it could be in Scotland or Wales. People who live in those two places get upset when they are referred to as being English.
Royal Mail, centered in London, delivers to anywhere in England, as wells as almost anywhere else. They should ship to any country where speaking English is a secondary language.
By first class mail, 2-7 days.
It depends on which country you're posting it from
Italy itself doesn't have an address: you can't mail something to a country because mail can only go to one location. It can't stretch across an entire country, so if you try to mail something to just plain Italy, it will probably either go nowhere, or go somewhere random in Italy or elsewhere. HOWEVER... You can mail something to the President or someone in the Parliament. That would work.
10 years
Post or Mail.
They sent mail when trading ships went over to England.
England and Wales are both part of the United Kingdom and in theory at least any item sent my first class mail should reach any other part of the UK the next day.
You can use regular postage stamps, but it will cost more to mail a letter outside the US. The cost to mail something from USA to England depends on what you are trying to mail. It costs $1.10 for a one-ounce letter. See related links for Postage Price Calculator to see what it would cost to mail other size items and packages.
It all depends on the size and weight of the letter or package. The cheapest is 32 pence.
If it is something small there should not be a problem. Ireland do not have a stringent import authority
There are several benefits to sending something by certified mail. By it's very nature, certified mail is signed for by a recipient, and this provides a paper trail should something go wrong. Certified mail also provides a certain amount of insurance value to the item being posted, and lastly, certified mail often takes less time to be delivered than mail sent in a standard way.