The currency in Amalfi is the Euro (EUR).
It’s always wise to exchange your Sterling before your trip. Especially when you can get it delivered straight to your door courtesy of Thomas Cook Travel Money. However, if you do need to withdraw some cash while you’re away, you’ll find plenty of ATMs in Amalfi and its surrounding towns. Debit and credit cards are also widely accepted, but you may want to contact your bank beforehand to make sure you won’t be hit with any unwanted fees.