I visited Slovenia this year by flying BHX-TRS with FR and hiring a car from there. It is a beautiful country and LJU a great place for a night out with lots of trendy bars. Loved it for the scenery, weather and the fact it isn't over-run by plagues of Brits abroad.
Adria used to fly BHX-LJU as well as MAN-LJU until about three years ago, once a week, like the MAN service it was block booked by tour operators, Inghams if I remember rightly.
I see from their route map Adria have virtually given up on the UK they don't even fly to London! I reckon this will be a route for EZY from MAN in the future.