The BBC report this fascinating discovery which seems to confirm the start of inflation (I would take issue with the slight implication that the BB is definitely the start of everything coming into being) or the Big Bang:

Scientists say they have extraordinary new evidence to support a Big Bang Theory for the origin of the Universe.

Researchers believe they have found the signal left in the sky by the super-rapid expansion of space that must have occurred just fractions of a second after everything came into being.