Were I in his position, an obvious scapegoat and certain to lose my job when, or before, it is all over, I should have had some sport with our xenophobic and semi-literate colonial cousins.
If you pay no heed to side-stepping and weasel-wording your answers and just use the hearing as a public platform to trip up and humiliate the questioners, you could have a field day.
Just putting a Brit with an Alan Rickman voice in the stand will have convinced the simple rednecks that BP is evil incarnate.
They should have had Stephen Fry or John Humphrys in the chair to put them straight.