Where do British expats work?

Short answer might be: the European Institutions, such as all the 'DGs'. But I assume you've already considered that, and ofcourse, maybe in a couple of years all the Brits will make their exit from the country! There's the british embassy, scottish parliament office, press offices etc.

You have bad experiences in Belgium as a blind person? That's interesting. In what way do you mean? I'm just curious because my colleague has two friends, who are both blind. I've talked to them both (and helped both of them at the train station once or twice). But I've never asked them if they find living in Belgium a particular problem for anything like that.

I have considered the EU, actually, but they only have translation trials in June. Also, I'm not really supportive of the institution in general, but I might forget that part if I could somehow work there.

Well, Belgians are just extremely anti-social. They either think I'm stupid (which results in them adderssing me like a deaf/old/mental person) or totally clam up and are too scared to talk to me (because I will of course attack everyone who dares to address me). British people are so incredibly sociable and helpful! I feel safer in England without any family member than here surrounded by acquaintances. Everyone just spontaneously helps and, you know, is friendly. No one says a word to me here. YOu're very welcoming in general.

I fear you may be mistaken in your view of us Brits; however, companies that need English speaking personnel will be those that use English in day to day business; companies like multi-nationals with outward facing functions to the English speaking world.  Having found one, you now need to ask yourself why would this company want somebody who has a masters degree in Spanish/Dutch/English (I'm assuming you have a diploma as a "Tolk"; so be legally qualified); so, what you're looking for is a multi, working to the Spanish world; Dutch is a minority language, so you'd limiting your scope; English/Spanish is a better mix.

What kind of job?  These companies are generally working in legal, accountancy and finance; do you have any experience in doing that.  In general, you need to tick some boxes in looking for work; I explain them as luck, experience, qualifications and speak the language - how many do you tick?  I reckon at best you have a 50/50 chance.

One last point; have you tried going back to your university for some leads; certainly here in the UK, your last year at Uni includes networking with the outside world.

Hope this helps; best of luck in your search.