Sam
Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is
Welcome to Benefits and Work We recommend that you use a Tracked post but I must stress that it is not a requirement and you should only do so if you can afford to do so. If you do use a Tracked post then you will normally have to visit your local Post Office, they can advise you on your options and the cost, the price goes up if you need a guaranteed delivery date. he following should give you some idea of price.
www.royalmail.com/sending/uk Gordon