Long term, that would help, and medium term, it might help. Short term, when the ATMs and banks are closed, and the banking networks are offline, so your Barclays Bank debit card won't work on the Iberian Peninsula, even though you have Pounds Sterling in your Barclays account, back in Britain, it won't make a bit of difference.
You live on the Iberian Peninsula and leave yourself SHORT of funds? You forget when the bank closes? You don't have a stash of cash in a safe in your cheaper-than-dirt Iberian Peninsula home? You have NO friends to borrow a few bucks from? You rely on a DEBIT CARD in Spain or Portugal? You have no credit card with which you can buy food, gas or medicine? You have NO ONE to call in Britain to say: Get me the HELL outta here....no money available!! No plan B?? No gold jewelry to barter with? All expats have some barter-gold!
Too dumb to live. No sympathy.