I have been offered a new job abroad in Europe, it has been a very long process and I didn't think it would happen. I have now been offered the position but they need me there before end of December due to Brexit Transition period ending. In my current job I have to give 4 months notice. I can give 3 months but not 4. I haven't spoken to my employer yet, I don't know how to word the request to end my notice a month earlier particularly when in this corona world it would be harder than ever to replace me/ train someone new. At the same time the job offered is my dream job and I don't want to risk losing the opportunity by dithering. How do I ask in an effective and decent way? I really need them to say yes but don't want to cause the company massive issues. I have worked for my current employer since I was 16 and they have always been fair to me. I don't want to let people down or ruffle feathers now.