One of the Buccaneer pilots either involved in the bombing, or close to those that were (Dougie Hamilton) told me years ago that the thing was extremely difficult to set fire to. They kept bombing it, small fires would start, only for the waves to put those fires out. The media made it sound as if it should have been easy, but according to him it was nowhere near as easy a job as at first thought. I'm pretty sure the small amount of oil that burned off from the bombing made little difference to the eventual outcome, which is probably why other ways of dealing with oil tanker accidents have evolved since then.