Last night my wife was trying to enter a Tesco (supermarket) voucher code in a website and got 0 and O wrong. The code she was emailed did not use a dotted 0.

Last night my wife was trying to enter a Tesco (supermarket) voucher code in a website and got 0 and O wrong. The code she was emailed did not use a dotted 0. She was reading the code on her phone and entering it into a web page.