From what I can remember, Servisair usually encourage people to do work experience particularly in months when they need the extra pair of hands, because today's work experience-rs are tomorrow's potential employees. This certainly used to be the mentality of most airlines & aviation companies in general, but whether for security or financial reasons, a lot of companies have pulled back on their student services, usually these are now only reserved for undergraduates at university. I think it's preferred if you're working towards a travel/tourism qualification, but would presume a nice cover letter showing your genuine interest in aviation would be enough to get you considered.