Securitas (in Spain) works a little different from place to place, it is a HUGE firm but as said the positions are hard to scale, on my place I got the law degree, some master in logistics(before getting hired), paramedic and almost any security qualification available in Spain, I work as low as manned guarding and no hope to get higher.
Every "district" works as a "small kingdom" for the regional leader in some way of franchise_alike if I understood, recently they got a "paradigm project" launched in Spain seeking for qualified professionals and so, to become the new leaders in the rising markets..., resulted I have not enough english level despite the other things so got some frustration.
They do pay regularly but, as I read you all, the business in UK seems a completely different world, we are hired full time or part time, we get the 12 wages and 3 extra payments (summer and xmas plus the "benefit pay"), we get paid holidays... but the problem is the basic salary is about 900€, we got more money for "dress payment" (uniform provided, you just clean and iron it) than as risk payment (so I assume it is harder to dress as a "grey man" than getting your face punched??).
I am a qualified instructor for SO, CPO, field guarding... (you do not even try to match the badges, it is a nightmare) but who cares, I am a registered lawyer since 2003 but who cares, I got paramedic courses but who cares, I am 37 and already got more badges than 57 men but who cares? I have been more than 10 years in door supervision and public events security (before it got regulated and so got mi badge too) but who cares.
If you get the chance to be hired I would send the CV because it is better to moan about a job than about no job at all
What happens is that many of us (plain "soldiers" in the staff) get second jobs to be able to pay the expenses as also the fantastic labor unions in Spain got us without wage rises again BUT got the compromise to avoid more than 170 h/monthly so you can not make money in one security job...