The elder Byrne said in an interview last month that he regrets not supporting the campaign.

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At the moment he has not made a definite decision but has admitted he regrets the Olympic furore of last year when a newspaper claimed he would prefer to play for Team GB in Brazil.

BBC: Rory McIlroy: I may not play in Rio Olympics

After having its patience tested to the limit over the last few years, NATO now says it regrets having to use force to get the Bosnian Serbs to comply with demands.

CNN: The scene in Sarajevo

Here are the No. 1 analysts in each of the 44 industries, with their top picks from last year and, in some cases, their regrets.

WSJ: How Wall Street Stock Analysts Became Best on the Street

Writing inside the paper, Lord Tebbit reveals that he often regrets not being at her side during her last days in office, having turned down an invitation to rejoin the Cabinet.

BBC: Newspaper review: Margaret Thatcher's legacy considered

The last bunch of new entrants were admitted more for their effort than their achievement, yet there are few regrets today.

ECONOMIST: Romania and the European Union

Over the last couple of years I have read a number of retiring CEOs asked by various newspapers whether they have had any regrets, all that I read said they had no regrets.

FORBES: Sorry, Mr. Sinatra - I Have Had Quite a Few Regrets in 2012 - and That is Good