Replacement NIE

I have padron in Santander but my job means I move all around Spain. I am currently working in El Prat, just outside Barcelona but only for 6 weeks before returning to London for a couple of months and then back to Spain but not sure where I will be working (and it will only be temporary) as my company has 12 places throughout Spain
My NIE has become faded and illegible. The bank would not let me open an account because they couldn't read it.
I want to claim El Paro so I think I need to get a new card and I don't know if it is better to report it to the police as lost. In this case would they issue a new one or would I have to go to the Foreign Office as well?
Or should I just go to the FO. Do I need to go back to Santander or can I go to the office in Barcelona and get it replaced on a temporary address in Barcelona or other town in Spain?
I am so confused. I have searched on the Internet but my case is not straight forward.
Any help would be really appreciated.
Thank you
Jackie

I do not think you mean an NIE.  That is an A4 piece of white paper.

However this should help.

TO MAKE AN APPOINTMENT WITH THE POLICE FOR  NIE,  E.U. Citizen registration, etc.

As you go through you will find links to the application forms and the payment, at any bank, form

.•            GO TO   https://sede.administracionespublicas.gob.es/icpplus/

•             PROVINCES AVAILABLE:       CHOOSE the province where your are living/ staying

•             SECTIONS AVAILABLE IN PROVINCE:          OPEN PAGE AND SELECT SECTION  REQUIRED

         NOTE there is now a special section for UK citizens which must be chosen  that is  “Polica-Certificada EU (Exclusivamente  para Reina Unido).  However if JUST for NIE select that

https://paste.pics/6caba0e207d3bcec0ba45036ee74c7c9

ENTER THE DETAILS OF APPLICANT. if you have an NIE show that, if not then show your passport number

•            CHOOSE NATIONAL POLICE STATION FOR APPOINTMENT:      The one that covers the area where you live
Motivo o tipo de solicitud de la cita, show reason for requesting appointment

•             CHOOSE AN APPOINTMENT,  AND THEN CONFIRM. If the office you require us not shown that means there are no appointments available at the moment  so please try again later

•             You must PRINT A COPY OF THE APPOINTMENT,   and take it with you to the police station
You can find info here in english about completing the EX15.    It is similar to an EX 18 so should help you understand what is required

http://www.exteriores.gob.es/Consulados … 0GUIDE.pdf

https://paste.pics/6caba0e207d3bcec0ba45036ee74c7c9