They had very frequent issues with their payment processors. The current account (now the only account as the prepaid beta programme has ended) runs on their i

They had very frequent issues with their payment processors. The current account (now the only account as the prepaid beta programme has ended) runs on their internally developed payment processor, and has so far had minimal issues. More information here: https://monzo.com/blog/2018/04/04/ending-prepaid/ https://monzo.com/blog/2018/04/04/ending-prepaid/