1st why did the Capt decide to keep the passengers/crew in the air for 4 hrs obviously getting very worried when a dump of fuel takes approx. 50mins and a return to Gatwick would take whatever from the point of the problem starting (after take off?)
Why rush? As Captain the last thing you are concerned with is the emotional condition of the passengers! (That does
not mean you would not take all reasonable steps to keep them informed though).
Would you rather have a safe landing after 4 hours or a runway excursion after 50 minutes resulting in damage/fire, injury and loss of life?