The currency in Spain is the Euro.
When or if you are considering changing £ sterling to € euros seek out the official money exchange offices or the choice of banks located across Spain in towns and numerous locations.
A number of currencies specialists here in the UK has grown and can offer good rates for holiday money and regular payments to fund your Spanish bank account to pay bills, local taxes and maintenance for any property you may own.
Properties Overseas can give you personal introductions to the above currency specialists, please contact us.
Looking to buy goods by debit or credit card, you may be asked for some form of ID. A driving licence is a good photo ID alternative to a passport.
Please check with your bank for the scale of charges you may incur on transactions before you travel.