Can someone explain this joke?

I'm assuming it requires some Spanish knowledge.

A Yorkshire couple go to the Costa Brava for a holiday, but on arrival, the wife says "I won't be able to make gravy with your dinner, love - I've forgotten the Bisto" The husband says, "Don't worry, there's an English couple staying in the next apartment, I'll see if they have any" So he knocks on the door of the next apartment, and says to the man" 'Allo, 'hast any Bisto" To which the man replies "Piss off, you Spanish prat!""

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