Same price on Amazon at the moment
Either will do if you top up with lemonade instead of soda. And Cava usually cheaper.
Surely you mean Prosecco not Cava?(confused)
Tesco have the 1 litre for £12. I think that is cheaper but that might be because of my tumbler of proper Pimm's. Don't like Aperol.
£12 a litre in Tesco