As an Area bod,it is reasonable to assume that the aircraft at 280kts had that restriction put on it and probably told to report it too the airfield on contact.If the facts are correct,that crew did not obey a control instruction,which had been put in place with the best of intentions.Where it was perceived to be in the sequence is another story,what if the pilot of the 'first' aircraft had increased speed to 340 kts,there would have been even less airspace to vector them in.This is an example of airmanship that has no place in busy TMA environments.