I know Aer Lingus are quite experience in the transportation of pets. When i worked at JFK for them we had at least 2 animals a day travelling from Dublin or back. It was relatively easy on the animal as sometimes the flight can be done in 5 hours but normally between 5-7 hours depending upon the direction of the flight. Then all you would have to do is either get the boat from Dublin to the UK or again get EI to fly from Dublin to London or Manchester. They fly from JFK Chicago Boston and Orlando, although i know they have connections with Jet Blue but am not sure if B6 transport animals.