Paris
The reputation of Paris as 'the' romantic city is well deserved and evidence can be witnessed on every streetcorner. It's architecture, historical significance and artistic treasures evoke an incomparable sense of quality, unique among the great European cities. Your wedding or event can evoke the classic Parisian style and the fine cuisine of France needs no introduction of explanation.
Paris is probably the easiest European capital city to access from the UK with a multitude of flights together with the Eurostar to take you very quickly.