Yes, the British Five Pound coin is technically legal tender. However, many merchants refuse to except them due to their low circulation. They can be used at government offices.
Yes it is legal tender, but only in the United Kingdom, not in the rest of Europe. All currency is legal until it is taken out of circulation. You can always take it to a bank and they will return it to the treasury and give you equal value in return.
Yes, they technically are, but not all stores or dining establishments will take them. Mostly these specially minted copper and nickel five pound coins are kept in collections or as souvenirs.
The British five pound coin is indeed legal tender, but it is vary rarely found in circulation. First introduced in 1990, they were intended to be souvenirs and collectibles.