CONFLICT BTWN CAPT AND FO OF B777 ARRIVING EGLL RESULTS IN DEV FROM ASSIGNED ALT. MISPROGRAMMING OF AUTOFLT SYS IS INDICATED.

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I WAS FLYING INTO LONDON HEATHROW AND GIVEN A HOLD CLRNC AT OCK AT FL120. AS I WAS DSNDING FROM FL380; I CLICKED THE AUTOPLT AND FLT DIRECTOR OFF IN CLR WX AND WAS MANUALLY FLYING THE ACFT. WITHIN 20 MI OF OCK; THE CAPT TOLD ME TO REENGAGE THE FLT DIRECTOR SINCE HE WANTED TO GIVE THE CUSTOMERS THE SAFEST AND SMOOTHEST FLT WHICH REQUIRED AS MUCH TECHNOLOGY AS WE HAD AVAILABLE TO US. I WANTED TO FLY MANUALLY; BUT HE INSISTED; AND WHEN I ENGAGED THE FLT DIRECTOR AND AUTOPLT; THE ACFT STARTED AN IMMEDIATE CLB; EVEN THOUGH I WAS ON SPD AT 220 KTS AND LEVEL AT FL120. I DISENGAGED THE AUTOPLT AS 150 FT HIGH OF ASSIGNED ALT; AND LEVELED BACK AT FL120. THE CAPT STATED HE DIDN'T KNOW WHAT HAD HAPPENED BUT HE WANTED THE AUTOPLT REENGAGED. I GAVE HIM CTL OF THE ACFT. HE ENGAGED THE AUTOPLT ON HIS SIDE AND THE ACFT IMMEDIATELY BEGAN A CLB. I CALLED OUT TO DISENGAGE THE AUTOPLT; AND STARTED CALLING OUT ALTDEVS. THESE WERE AT 150 FT; 200 FT; 250 FT; 350 FT; 400 FT; 500 FT HIGH. FINALLY HE DISENGAGED THE AUTOPLT AND ARRESTED THE CLB AT 550 FT HIGH; AND FLEW THE ACFT BACK TO FL120. WE GOT A CALL FROM LONDON DIRECTOR ASKING US WHAT ALT WE WERE AT; THEN AN 'OK; PICK UP HOLDING AT OCK.' MY CONCERN BESIDES THE CAPT 'FLYING' MY ACFT AND INSISTING ON HOW I FLY AND IN WHAT MODES AS A FULLY CAPABLE AND QUALIFIED PLT; BUT THAT HE CONTINUED TO FLY THE ACFT IN AUTOPLT PAST OUR ASSIGNED FLT LEVEL. I GAVE HIM CTL OF THE ACFT AND HE FLEW TO A LNDG WITH NO OTHER OCCURRENCES.