Grappler,

There are many training providers that offer many things. Some are better known than others. Look around and see what suits your needs best. All bring something to the table.
As for employment after the course, that I am afraid is mostly down to yourself, no truthful company should guarantee employment, however a good provider will assist graduates as much as possible, cv construction, introductions to employers, advice on where to start etc.

As you are not hoping to work in HE then I fail to see how a firearms course would benefit you apart from to look good on a cv , however as almost all work in EU and definately all work in the UK will be unarmed , surely a sound driving course or medical course would be a better use of your cash and would assist employment more than a firearms course that you will not use??

SIA license is solely required within the UK, and yes it is a good tool to have for work overseas however it is not a necessity. Many companies want to see your experience and your history when considering you for employment and this industry is all about reputation, not just the course you attended , but your reputation amongst your peers.
Ronin has a top reputation especially in the medical field.
I would recommend that you look around, call and ask what the training provider can do for you , after all it is your cash and in essence your investment in yourself. Take care