German Chancellor Angela Merkel's Christian Democrat party may face a new coalition as recent polls show that their Bavarian sister party is only just above the 5% threshold for staying in parliament.
Should the Free Democrats (FDP) fail to be re-elected, Ms Merkel may be forced into a "grand coalition" with the Social Democrats (SPD), like her first government of 2005-2009.
Such uncertainty would affect weaker economies on the euro zone's "periphery", pushing up yields on the likes of Spanish and Italian debt relative to Germany's, the euro zone benchmark.
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Dr Joan Harvey warned that the new designation might cause unnecessary concern among parents.
German news agency dpa reported that prosecutors decided to seek Mr Stadler’s arrest due to fears he might try to evade justice.
David Dimbleby is stepping down after 25 years presenting the BBC show.