Getting the A4 certificate is easy for EU members!. Oh and some banks etc WILL ask for it.
Tried to cash my expenses cheque today at the "issuing branch" and they wanted passport and NIE cert. The fact I have a NEW Spanish drivers licence and work for the town hall 150m from the branch) held no water (does with the
GC and police). Oh well another good reason not to use "La Caixa".
God I miss my little plastic card.