This question already has an answer here:
I left my last employer in the UK end of last year, but he still pays me my monthly salary. (It feels like one of these surreal dreams) In march I told them about it and asked how I should deal with it. But even though I addressed it to my CFO and copied in the CEO, the CFO only replied to some other questions in the same email, but ignored the overpayment issue. Since then I still get monthly payments, but I'm not sure whether I can keep it or if I need to save it until they realise that error? It would be great if someone can help me with this, because I'm not familiar with the UK law system as I'm from another European country.
Are there any deadlines for them to notify me? What are the chances for me to keep the money? (only from a legal point of view, not from a moral one)