Looks like the British have a fairly strong Competition Commission, unlike our own toothless crowd here. According to Reuters: http://www.reuters.com/article/businessNews/idUSLK6800120080820?feedType=RSS&feedName=businessNews
BAA are going to have to sell several of their airports, including 2 of the three London airports they currently own.
Whereas here in Ireland it looks like Shannon, Cork and Dublin are to remain under Aer Rianta/DAA for the foreseeable future.