2 weeks in Europe: UK or Italy

Hey all, my wife and I are looking at to doing a trip in either November or January to celebrate turning 30. We'd have about 2 weeks. Should we do Italy or the UK? I spent a summer in Rome so I've been to places but it is hard to beat Rome and Florence. Neither of us have been to the UK outside of London so Scotland, Wales, and other parts of England would be new to both of us. Which should we look into doing the UK or Italy?