When travelling overseas there is generally the need to get different currency prior to leaving - as in Britain we do not have a denomination with other countries. You will probably have to go to make a currency exchange - this is normally done at a bureau de change and best completed before you travel. You can additionally get the cash dropped off at your house if you make an order on the net and will usually get a superior exchange rate than in a shop. There are a number of scenarios when you will need to buy foreign currency. This could possibly be when going over land on holiday or if you are getting a property or making any transaction in a foreign currency. Acquiring the best foreign exchange rate is the most important factor here - so ensure you look around and visit a number of currency exchanges before you pick. On the other hand you might choose to buy online and save the hassle and funds.