CONFUSION OVER THE LIMITATIONS OF A CLB CLRNC IN FOREIGN AIRSPACE.

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YOUR CONFUSION REGARDING WHAT OUR CLRNC WAS WAS SHARED BY OUR CREW ON THE DEP OUT OF LGW. I CERTAINLY RECOGNIZE THAT IT IS ALWAYS THE CAPT'S RESPONSIBILITY TO SORT OUT ANY CONFUSION REGARDING A CLRNC; BUT IN LIGHT OF THE CONFUSING ATC HANDLING OUT OF LGW; YOUR AND OUR CONFUSION IS JUSTIFIED UNDER THE PRESENT CIRCUMSTANCES. I WOULD RECOMMEND THAT WE SIT DOWN WITH LGW ATC AND TALK ABOUT THIS PROB BEFORE THERE IS A SERIOUS ALT VIOLATION. WE NEED PREVENTIVE ACTION HERE; NOT SIMPLY A NOTE TO ME THAT A VIOLATION DID NOT OCCUR. I FLY A LOT OUT OF LGW AND LHR AND WOULD BE GLAD TO HELP IN SUCH DIALOGUE IF YOU DEEM APPROPRIATE. I CAN ALMOST SAY WITH CERTAINTY THAT THERE WILL BE FURTHER PROBS ON THIS DEP IF NO PREVENTIVE ACTION IS TAKEN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR CLARIFIED WHAT THE CLRNC CONFUSION INVOLVED. HIS FLC WAS GIVEN A CLRNC AFTER DEP TO CLB TO 6000 FT. PRIOR TO REACHING 6000 FT THERE IS AN INTERMEDIATE RESTR OF 3000 FT; WHICH THE FLC INTENDED TO LEVELOFF AT UNTIL THEY RECEIVED THE CLRNC OF CLB TO 6000 FT. THEY CONTINUED THEIR CLB RIGHT TO 6000 FT WITHOUT STOPPING AT 3000 FT. THE DEP CTLR CONTACTED THEM FOR THEIR ALT WHEN THEY WENT ABOVE 3000 FT. FLC RESPONDED THEY WERE OUT OF 3000 FT; CLBING TO 6000 FT. DEP CTLR WANTED TO KNOW WHY THEY LEFT 3000 FT; TO WHICH THEY REPLIED; 'YOU CLRED US TO 6000 FT.' DEP STATED THEY SHOULD HAVE STAYED AT 3000 FT UNTIL PASSING A CERTAIN WAYPOINT. THIS RPTR TOOK THIS RPTED EVENT TO HIS ACR SAFETY REPRESENTATIVES. THEY IN TURN TALKED WITH LGW DEP AND FOUND THAT WHEN AN ACFT IS CLRED TO A HIGHER ALT THERE ARE NO RESTRS TO CLB UNLESS ATC REESTABLISHES THOSE RESTRS. SO NOW; THE CLRNC TO CLB IS VERY MUCH LIKE WHAT IT READS AND SOUNDS LIKE IN THE UNITED STATES. DON'T CLB UNTIL CLRED FOR THE CLB AND LEVELOFF AT RESTR ALTS ONLY WHEN ISSUED AS RESTR.