Eurostar urges potential rivals to invest in new depot facilities / Eurostar trains hit by delays ahead of Easter weekend / KLM, FlixBus and Eurostar warn UK travellers of new documentation rules / Plans to break up Eurostar monopoly given boost by rail regulator / Virgin plans high-speed rail to compete with Eurostar; Amsterdam on the route / Eurostar halts London-Paris trains for rest of day after unexploded bomb found / Eurostar trains from Paris cancelled after WW2 bomb found near tracks / Eurostar trains cancelled after unexploded WWII bomb found in Paris / First pic of 660lb WWII BOMB on tracks that's shut Eurostar emerges as trains cancelled & passengers told 'don't travel' / Eurostar cancels all travel as WW2 bomb found on tracks