Of course, Iran bears no responsibility for this incident at all. From [1] IRNA, with thanks to Sr. Soph:

Foreign Ministry spokesman Mohammad-Ali Hosseini Saturday categorically condemned the "illegal entry" into Iranian territorial waters of British forces.

Hosseini considered the "illegal and interventionist" entry into Iranian territorial waters of British forces as a "suspicious move and contrary to international rules and regulations." Referring to the "biased nature of such movements", he said, "Violating the sovereign boundaries of other states and illegal entry denote unusual goals in violation of international commitments, the responsibility for which cannot be evaded under any justification."