BAE125 CLBING TO FL370 ENCOUNTER A SEVERE ROLL CAUSED BY WAKE TURB FROM A B757 8 MI AHEAD AT FL370.

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WAKE TURB UPSET BEHIND A B757. WE WERE LEVEL AT FL350 DOING .75 MACH; ABOUT 220 NM S OF DIW NEAR AR7. WE WERE FLYING A HEADING OF 005 DEGS AND A TRACK OF 018 DEGS. THE WINDS WERE 274 DEGS/65 KTS. WE WERE FILED FOR FL370 BUT WE HAD TFC AT 11 O'CLOCK POS AND 3 NM AT FL370. ZJX (135.07) CALLED AND SAID IF WE SLOWED AND GOT 8 NM BEHIND THE TFC THEY WOULD LET US UP TO FL370. WE SLOWED TO .70 MACH AND WHEN WE WERE 8 NM BEHIND THE TFC; CTR GAVE US FL370. WE WERE CLBING AT .70 MACH AND AROUND 500 FPM. WHEN WE WENT THROUGH FL365 I FELT A SLIGHT NIBBLE FOLLOWED BY A SEVERE ROLL TO THE R. IT TOOK FULL L AILERON AND SOME TIME TO RECOVER FROM THE ROLL. WHEN THINGS FINALLY SETTLED DOWN AND WE WERE BACK TO WINGS LEVEL OUR ALT WAS FL373. CTR CALLED AND SAID WE WERE ONLY CLRED TO FL370. WE RESPONDED 'WE WERE RECOVERING FROM A WAKE TURB UPSET.' WE WERE HANDED OFF TO ZJX (120.12). WE ASKED THE NEW CTLR WHAT WE WERE FOLLOWING AND WHAT HIS SPD WAS. ZJX SAID A B757 DOING .80 MACH. WE ASKED IF WE COULD SLOW DOWN TO 10 NM IN TRAIL. CTR ASKED IF WE WANTED TO TURN L OR R. WE SAID L AND TURNED L 15 DEGS MAINTAINING .70 MACH. WHEN WE WERE 12 MI BEHIND AND SLIGHTLY L OF THE PATH OF THE B757; CTR CLRED US BACK DIRECT DIW.