You can also register aliases somehow. If you need to send something (cheques etc) to Monzo bank I'm pretty sure you can just write "Monzo" on the envelope. No

You can also register aliases somehow. If you need to send something (cheques etc) to Monzo bank I'm pretty sure you can just write "Monzo" on the envelope. No stamp needed. Pretty sure = it worked like 6 years ago when I last encountered a cheque.