Mrs FF and I were on an ERJ 145 when it got caught in wake turbulence approaching MAN. It was a lovely summer morning and we were over Stockport when the aircraft rolled violently to one side. It then righted itself before rolling violently to the opposite side. Full power was applied and the pilot abandoned the approach and climbed. He spoke to the cc member at the front of the aircraft who assured him no-one had been injured and then informed the passengers by intercom our flight had been caught in the wake vortex of a heavy aircraft. We went round and made a second normal approach and landing.