Sun Air own a company called JoinJet which operates charters using business jets and Dornier 328jets (their own and the Sun Air ones seem interchangeable).

They have operated a few routes to the UK. LCY-Billund relaunches next month. They also flew MAN-BLL and MAN-GOT at times. I think the AstraZeneca shuttle now operates Gothenburg-Cambridge-Manchester but is no longer available for commercial passengers.

They also announced LCY-Bremen at one point but I don’t think it happened.