Hard to find any info but looks like I was right - although the break in service was brief (and Transavia are Dutch not Danish, but this was amateur local news in Essex):
A DANISH budget airline will begin to fly twice-daily from Essex to Amsterdam later this month. Basiz Air is to operate out of Stansted - the only airport in the UK from where the company will fly - with an introductory one-way fare of nine euros - about £3.60 - which is less than a packet of cigarettes. The airline is part of Transavia Airlines, which is 80 percent owned by Dutch national carrier KLM. Basiq stepped in after budget airline Buzz, now owned by Ryanair, pulled off the route earlier this year