Of the "traditional" banks First Direct generally have quite a good reputation. I've used them for a while and they've been fine. Customer service is good on th

Of the "traditional" banks First Direct generally have quite a good reputation. I've used them for a while and they've been fine. Customer service is good on the occasions I use it and the product's been reliable. That said I'd be surprised to see a bank like Monzo just fold without warning. It's possible that one or more of the "challenger" banks won't last a long time, but the outcome there will most likely be them getting bought by someone else.