Travellers cheques are cheques bought in your own currency and valid in another. You have to sign them (and usually show your passport) to exchange for currency notes, so they are more secure than cash. But they do usually cost more in commission. Good news is if you don't use them you can usually exchange them without penalty on your return.
You can buy foreign currency at most banks and building societies and if it is a common currency you usually don't have to wait. BUT - It is often better just to take your cash card abroad with you and get cash as you need it or pay by card. See my article on foreign exchange and the best deals at
http://www.helium.com/items/1165485-fore…