In a Dragon's Den special entitled 'How to Win in the Den', aired on BBC2 on Wednesday 28th September, Red Button Design gave us a glimpse of the progress they have made since appearing on Dragon's Den in 2007, along with a sneak peek at the latest incarnation of the Midomo water purification device that has made their name.

It’s been almost 4 years since Amanda Jones and James Brown, two Glasgow University graduates, first entered ‘The Den’ hoping to raise awareness of their water purification device, known then as ‘ROSS.’ Whilst the two students clearly believed they had a good chance of a favourable reception, as they ascended those stairs they hadn't quite anticipated that Red Button Design would become the first company ever to be offered investment from all 5 Dragons for the original equity offered, or the first Social Enterprise to be offered investment at all.

For your viewing pleasure, here is the original segment from the Den back in 2007 - see if you can spot the fancy editing.