Ray Duffy, co-founder of Printed Little Things appeared on BBC TV's Dragons' Den way back in 2009 with a previous business!
Mask-arade, a startup created by Ray and two friends, Dean Walton and Chris O'Nyan shot to fame after appearing on the hit TV show. Read more about it here: https://www.thisismoney.co.uk/money/news/article-2154157/Mask-makers-failed-Dragons-Den-laugh.html
The Dragons didn't invest in the company but it didn't stop them from having a very successful future, resulting in acquisition at a later date.