6. MediaDevil

Founder: Callum Bush
Founded: July 2009 
Website: www.mediadevil.com

MediaDevil’s range of products to protect smartphones and tablets, may not sound that exciting. However, it is founder Bush’s unwavering focus on service which has made his business both innovative and sustainable. Selling his range through marketplaces such as Amazon, eBay and Play.com, in 2011 he bounced back from a thwart of malicious attacks by competitors to become Amazon.co.uk’s fourth ‘most five-star-rated product’ of the year – ahead of Adele’s record breaking 21 album.

His screen protector brand remains the best-selling on Amazon.co.uk and Amazon.it and projected turnover for next year is £4.5m. Customers so far total 300,000, but with other products in the pipeline and expansion to Amazon.fr, Amazon.de, and Amazon.es, this number is set to rocket.