GOULI
I am now much better informed about the decision processes and it makes a lot more sense to me now rather than listening to an ATC conversation with Shannon and seeing a map with a flight path heading out into the Atlantic before turning back.
I apologise if anyone felt offended by my comments. It genuinely wasn't meant that way. This thread has given a good insight into the multiple decisions flight crews must balance and the decision to return to Heathrow could not have been lightly made. Fortunately there was a safe outcome for those involved.
Maybe the best thing you can learn from this is that you have two ears and one mouth and to use them in that ratio.