What will happen to post office worker who topped up my electric key with more than I paid for?

Posted by Chanson_Riders@reddit | AskUK | View on Reddit | 84 comments

I'm just back from the post office after topping up my gas card and electric key. I asked for £20 on each.

When I put the key into the electric meter it read £40. Initially I thought she had mistakenly put the entire £40 on my key and nothing on the gas card but the gas card is topped up with the £20 I requested.

She has given me an extra £20 on my electric key.

I wasn't exactly planning on putting £40 into it. Do I go back and pay up or just leave it?

I don't want her to get into trouble.