as a recruitment consultant who has dealt with plenty of spanish actuaries wanting to come the other way, I would salaries in Spain are very low. some characteristics of the Spanish actuarial market:
1. you qualify by degree. you do a degree, or masters, in actuarial science and you become a fully qualified actuary
2. the work tends to be much less sophisticated. people with pensions/investments exp tend to also do a lot of audit work. people with a GI background might do quite a lot of basic data handling/manipulation. consultancies will also often mix disciplines - it's not unusual to have consultants doing a mish-mash of life and GI consulting work (in fact I placed someone like that 18 months ago)
3. salaries are very low - we are talking 35-55k euros for someone with 2-4 yrs exp, which is not that much, not even when you take into account lower living costs. it's about 40% more expensive to live in London compared to Madrid, and the salaries unfortunately do no compensate for it
anyone with any questions/queries, feel free to post here, or PM me if you want to talk privately