CAPT OF A BRITISH JETSTREAM JS32 STOPPED PAST THE RWY HOLD SHORT LINE CAUSING THE TWR TO ABORT THE TKOF OF A SUPER MD80 AND ANOTHER ACFT ON FINAL TO BE SENT AROUND.

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THE CTLR GAVE US SEVERAL HDG CHANGES; AND ASKED US IF WE HAD THE ARPT AND A B757 INBOUND RWY 12R IN SIGHT. WE ACKNOWLEDGED BOTH THE ARPT AND THE JET IN SIGHT; UPON WHICH SHE CLRED US FOR THE VISUAL APCH RWY 12L. APPROX 1000 FT TO 700 FT AGL; SHE TOLD US TO THEN EXPECT RWY 13 INSTEAD. A FEW SECONDS LATER; WE WERE CLRED TO LAND ON RWY 13. I DID NOT HAVE TIME TO BRIEF MY FO ON WHICH TXWY WE WOULD USE TO EXIT THE RWY. UPON LNDG; I APPLIED THE BRAKES; AND AS WE WERE APCHING THE TXWY N; SHE TOLD US TO 'TAKE THE HIGH SPD OFF THE RWY.' THE STATEMENT CONFUSED ME; AS THERE IS NO HIGH SPD TXWY OFF RWY 13. AS I WAS PASSING TXWY N; THE CTLR SAID 'I'M SORRY; WHAT I MEANT WAS; TAKE TXWY; N; YOU CAN MAKE A 180 DEG TURN IF YOU WANT.' THE LAST FEW WORDS OF HER CLRNC THOUGH; I WAS NOT ABLE TO DISTINGUISH; AS I WAS ADDING SOME DIFFERENTIAL PWR TO TURN THE AIRPLANE AROUND. MY FO QUICKLY RESPONDED TO HER CLRNC; YET I COULD ONLY HEAR HIM VERY FAINTLY AS HE WAS HOLDING IN THE PUSH-TO-TALK MIKE SWITCH. AS I WAS TURNING AROUND AND TURNING ONTO TXWY N; I WAS TAXIING VERY SLOWLY; AND I NOTICED AN ACFT AT THE END OF RWY 12L WHICH DIDN'T APPEAR TO MOVE. I STOPPED ON TXWY N WITH MY NOSEWHEEL JUST ABOUT 1 FT PAST THE HOLD SHORT LINE. AT THAT POINT; THE CTLR SAID 'ACR X STOP.' A FEW SECONDS LATER; THE CTLR TOLD ACR Y JET ON RWY 12L THAT THEIR TKOF CLRNC WAS CANCELED AND ANOTHER JET INBOUND RWY 12L TO LAND TO GO AROUND. WE WERE LATER TOLD BY THE CTLR TO CALL THE TWR; AND AFTER PARKING THE AIRPLANE; I WALKED UPSTAIRS TO THE TWR WHERE I TALKED TO THE SUPVRS STL ATCT CTLR AND ATCT CTLR. I WAS TOLD BY CTLR TO CALL BACK LATER ON THAT NIGHT TO HEAR MORE ABOUT THEIR FINDINGS. LATER THAT NIGHT I CALLED BACK AND TALKED TO CTLR WHO IS IN CHARGE OF QUALITY ASSURANCE. TOLD ME THAT THEY FOUND THAT I HAD NOT VIOLATED THE SAFETY DISTANCE TO THE OTHER ACFT; BUT SINCE MY NOSEWHEEL HAD CROSSED THE HOLD SHORT LINE; IT WAS A ROUTINE PROC TO CANCEL ANY TKOF AND LNDG CLRNCS. HE ALSO TOLD ME THAT HE FOUND SOME OF THE INSTRUCTIONS I RECEIVED TO BE INCORRECT; AND THAT HE COULD UNDERSTAND WHY THOSE INSTRUCTIONS COULD BE VERY CONFUSING TO ME. HE THEN TOLD ME HE WOULD STAY IN TOUCH WITH MY COMPANY'S SAFETY COORDINATOR; CAPT ACR X.