Based on Episode 3 of The Beatles Cartoon! ˗ˏˋ ꒰ ✉︎ ꒱ ˎˊ˗

The Beatles had no money, so they sent for their friend/producer [?] Brian to send them some money for food. The envelope came during a show. The mailman weaved his way through crowds of screaming girls just to deliver it to them! but when they finally get the letter, they realize it's not money...

John opened the letter, but it wasn't the money from Brian.

John: "Ahem 'Attention. Final notice: Pay your electric bill, or your bloomin' power will be cut off!' Signed, Liverpool Light Co.! Oh no!" Ringo: "Who cares if they shut off the lights? Livepool's like, a million miles away!"

the lights shut off.