europeans can audition for the x factor uk 2013, because of the eu right to work, this means that people from the eu can audition it says this below on the x factor's rules:
"You must have the right to live and work in the UK, Channel Islands, Isle of Man or Republic of Ireland".
so on the uk border agency website it says that:
"As an EEA or Swiss national, you have the right to live and work in the UK (known as the 'right of residence') if:
you are working here (and have obtained our permission to work if this is required - see below); or
you can support yourself and your family in the UK without becoming an unreasonable burden on public funds."
so you do need to meet those requirements to stay in the uk, though if you just travelled to the uk to audition and then travelled back home, spain for example, that would be expensive, travel etc wise, and so you would not be living in the uk and just coming to audition so that would be a lot easier.
if you planned to stay in the uk between auditions then that would be more difficult and so you would need to meet the requirements of the border agency.
it would also be easier if you was coming to the uk to audition for the x factor and had friends and family to stay at.
so auditioning for the uk x factor when you are from one of these countries depends on your situation as to how easy or difficult it will all be, obviously if you decided to work and live in the uk that would take a lot of setting up and organising.
but if you was just day travelling that would be easier though expensive.
these are the countries that currently are in the European Economic Area (EEA) though some of these countries below have there own x factor contests in 2013 so it would be much easier to audition in the country you live in!.