The red card with the BP logo on the back entitles you to 3cents off a ltr of fuel at BP stations in Spain. They are given out to season ticket holders and members.
Not much good to you in the UK. You could keep hold of it and use it to fill up a hire car whenever you’re in Spain.
Ah… Well it’s a nice little bit of memorabilia anyway. 
@sevilla_spurs just noticed you said Bar Europa. That’s a bit of a hike from the stadium no? Our family goes there pretty often when we are in town.
No, it’s 500 metres from the stadium mate on Calle Benito Mas y Prat. It’s where the Guiri meet mostly after the game but I am normally there before also…
ahhh Cervecería Europa instead of Bar Europa which is near Plaza de la Alfafa.