ACR ON OVERNIGHT OCEANIC FLT IN HOLD PATTERN. CONFUSION REF CLRNC. DSNDS; TCASII RA.

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WE ARRIVED AT THE HOLDING FIX AFTER FLYING ALL NIGHT FROM MIAMI IN OUR WDB. I WAS THE PF. THE PNF WAS NY CHK AIRMAN GIVING ME MY INITIAL ATLANTIC-EUROPE CHK. ATC VECTORED US INTO THE PATTERN. WE CROSSED THE FIX ONCE; THEN WHEN OUTBOUND WE RECEIVED A CLRNC OF 4 ITEMS (I THINK). 1) 'R TURN; RETURN TO THE FIX. 2) OPERATE AT 210 KTS. 3) 'DSND TO FL80.' 4) 'DEPART THE FIX ON 280.' I STARTED DOING THESE THINGS WHILE THE PNF HD SOME DIFFICULTY WITH THE READBACK. I HAD STARTED AN EASY DSCNT (PNF WAS STILL SORTING OUT THE CLRNC) WHEN WE HEARD 'TFC; TFC' ON THE TCASII. THERE WAS AN AMBER TARGET RIGHT NEAR US AT -.9 (900 FT BELOW US). 2 OF US ON THE L SAW AN MDT ABOUT TO GO UNDER US. THE TCASII THEN SAID 'MONITOR VERT SPD.' THE DISPLAY SHOWED -.9 FOR ANOTHER 10 SECONDS OR SO. I THEN DIALED IN A POSITIVE VERT SPD. THE PNF DIALED IN MORE AND RESET THE ALT KNOB TO 9000 (I HAD SET IT AT 8000). THE PNF THEN TOLD ATC WE WERE GOING BACK TO FL90 AND ASKED FOR A CLARIFICATION OF OUR ASSIGNED ALT AND HDG. ATC DIDN'T SAY WHETHER WE HAD ERRED. MORE HDGS AND ALTS WERE ASSIGNED AND WE LANDED UNEVENTFULLY. NONE OF US KNOWS FOR SURE IF WE WERE ACTUALLY CLRED TO LEAVE 9000. I USUALLY LISTEN FOR ALTS GIVEN TO OTHER ACFT IN A HOLDING STACK. IT DOES APPEAR THE MDT WAS DSNDING. MAYBE WE WERE CLRED TO HIS VACATED ALT. I KNOW WE WERE ALL SOMEWHAT FATIGUED (NATURALLY) BY OUR ALL NIGHT FLT (AS ARE SEVERAL HUNDRED OTHER AIRMEN EVERY MORNING AFTER EBOUND TRANSATLANTIC FLTS)! EVEN WHEN ALERT AND RESTED I HAVE PROBLEMS READING BACK AND RESPONDING TO MORE THAN 2 CLRNC ACTIONS GIVEN TOGETHER. THE BEST CTLRS GIVE YOU 2 ITEMS; WAIT FOR YOUR READBACK; THEN GIVE YOU THE REMAINDER. AS FOR ME; I INTEND TO BE MORE DELIBERATE IN TAKING ACTION; ESPECIALLY ALT UNTIL THE CLRNC(S) HAVE BEEN CLRLY ACKNOWLEDGED. SUPPLEMENTAL INFO FROM ACN 191599. WE WERE HOLDING OVER THE OCK VOR AT 9000 FT; WAITING TO LAND AT LONDON HEATHROW. ATC INSTRUCTED US TO TURN TO A 280 DEG HDG AFTER THE VOR FOR VECTORS. THE R SEATED PLT READ BACK 080 DEG HDG. THE OTHER COPLT ON THE OTHER JUMPSEAT CORRECTED THE R SEATED PLT; WHO IN TURN THEN READ BACK THE APPROPRIATE CLRNC TO ATC. THE CAPT; FLYING; THEN TURNED TO A 280 HDG BUT DIALED IN 8000 IN THE ALT WINDOW. (COMPANY PROCS REQUIRE THE PNF TO OPERATE THE ALT WINDOW). THE ACFT THEN STARTED A SLOW DSCNT TOWARDS 8000. SHORTLY THEREAFTER THE TCASII ALERTED US TO TFC BELOW US WHICH WE COULD SEE AS A MDT. NOBODY; INCLUSIVE OF MYSELF; SAID A WORD ABOUT OUR ALT EVEN THOUGH EVERYONE WAS AWARE OF IT. I PERSONALLY THOUGHT THAT I HAD MISSED SOMETHING THAT THE CAPT AND REST OF THE CREW HEARD REGARDING ALT; SO I DIDN'T QUESTION IT. ADDED TO THIS WAS THE FACT THAT THE CAPT HAD SO DELIBERATELY CHANGED THE ALT. THE ACFT DSNDED TO 8400 MSL WHILE THE TCASII CONTINUED IT'S ALERTS. AT THIS POINT THE R SEATED PLT CONFIRMED WITH ATC THAT OUR ALT ASSIGNED WAS IN FACT 9000. AS A SOLUTION; EACH OF THE 3 PNF SHOULD HAVE QUESTIONED THE CAPT.