People only just realising there's a 'hidden' code on your Royal Mail letters
![People only just realising there's a 'hidden' code on your Royal Mail letters](https://i2-prod.dailystar.co.uk/news/weird-news/article32980413.ece/ALTERNATES/s615/1_gettyimages-458862719.jpg)
A man has been left scratching his head after noticing a strange code written all over his post - making him wonder why it's different on every letter and why it's there in the first place