"Given that there will be set up costs for the rail franchise operator and that the current franchise ends in 2018 it is most probable that the cards will only be fully functional when the new franchise is in place, " said a spokesperson.

BBC: Welsh Oyster travel card scheme faces delays

Look further ahead, and it is probable that there will be a disagreement between Britain and euro-zone countries over the exchange rate at which Britain joins the euro.

ECONOMIST: The single currency

With the police as yet having contacted only the tiniest fraction of the thousands of people whose phones may have been hacked by a private detective in the employ of the News of the World, it is probable that there will be week after week of new shocking disclosures about the privacy of individuals being invade improperly.

BBC: Murdoch's biggest setback?

They hope that next year it will be probable and then certain in 2015.

BBC: Where do Labour stand after 2012 conference?

Even if you believe in yourself and your project, it's probable that your first intent will be a failure.

WSJ: Liability Standard Risks Stifling Spain

It is probable that this burden bourne will be higher than the tax collected which makes it an inefficient tax.

FORBES: The Truth About the Financial Transactions Tax or the Robin Hood Tax

In addition, it is probable that the orbiting module will be followed up in the next few years by something that is more recognisably a space station, though this station is unlikely to be manned full-time.

ECONOMIST: China in space