Zadar is a recognised destination and very nice it is too. I thought it was fairly well known but thinking about it because it’s been so well served locally here in Essex perhaps we’ve been able to take it for granted. Not just the fairly long-standing Ryanair at STN but a weekly charter using Titan and Jet2 also announced it prior to Covid. Stobart/Flybe also did it from Southend until they closed the jet operation.
Its fairly well served from elsewhere in Europe. There are established ‘Med’ destinations for whatever reason never made it with Brits, this is obviously one of them.