ENTRY REQUIREMENTS AND VISAS
A full British passport, valid for the duration of the visit, is required to enter mainland Spain, the Balearic and Canary Islands.
EU, Norway and Iceland citizens do not require visas for visits whatever the length and purpose of the visit.
Holders of passports valid for the entire period of the visit, issued by Canada, Japan and the USA do not require visas for visits of under 90 days, but a special visa is required for longer stays.
All other nationals should contact the Spanish Consular authorities.
 

DRIVING LICENCE.
If you’re planning to drive in Spain, you can in general use your UK licence without any problems. Just make sure that your licence is up to date before you leave and that you have it with you.
 

PRODUCTS THAT YOU CAN BRING TO SPAIN
According to the European Commission, travellers may not bring any animal food products into Spain, neither for their own consumption, nor as part or their luggage (including meat, meat products, milk, and dairy products). The only exception is baby powdered milk, sealed in its original package. Any other foods may be brought into Spain, up to a maximum weight of one kilogram. The traveller is allowed to carry in his or her luggage items for personal or family use, as well as gifts, as long as they are not considered commercial merchandise for their nature or quantity. This will be determined by customs officials at the border checkpoint.
In accordance with European ruling, as from the 1st of July 1999, duty free allowances on imports into EU countries ceased to apply on goods bought within the EU. Limits on the import or export of tobacco and alcoholic drinks within the EU vary from country to country. The restrictions operating in Spain, which are different to those in force in the UK and Ireland, are shown below :
TOBACCO: 800 cigarettes or 400 Cigarillos or 200 Cigars or 1kg Tobacco.
ALCOHOL: 10 litres of spirits or 20 litres of fortified wine or 90 litres of wine, of which 60 litres can be sparkling, or 110 litres of beer.
 

The TSA (Transportation Security Administration) enacted new airport rules following an alleged terrorism incident in London in August 2006, and passengers on US and European flights are now allowed to carry only tavel sized (3 ounces US/100 ml EU or less) containers of liquids or gels through airport security in one one-quart sized plastic, clear ziplock-style bag. Beverages purchased in the airport after clearing security are also permitted aboard.

The other thing you need to consider is weight of the suitcase as if you had to pay excess baggage it could cost a fortune. The airline we usually use don't have a weight limit on hand luggage so I usually try to get most in there.