Sharks or good business?
At the moment with "slots" in very short supply at UK airports merger is the name of the game if you want to expand.
It would seem to me that following the takeover of GB airways by easyjet expanding into the long haul sector would be the next logical step.
(please note that the GB LHR slots were not part of the easy jet deal and went to an American airline for a considerable sum)
To this end Siverjet must be a prime target with routes out of a big Easy jet base.