As far as I know, the reason for this strike in particular has nothing to do with their hours or salary, but with Enaire taking disciplinary measures against ATCOs for the airspace closing back in 2010.
Blimey, they bear a grudge for a long time, don't they!
Now, look here all you lovely Spanish ATC peeps. Me and Mrs Elpus are on the early morning Easyjet Luton to Alicante flight next Thursday (17th) and we'd be terribly grateful if you don't take any action on
that day.
Adios amigo.