EasyJet Opening Southend Base
EasyJet to start flying from Southend airport | Business | guardian.co.uk
easyJet to launch services from London Southend Airport
Looks like, they are basing three aircraft there, so quite a reasonably sized base.
Hope no more Luton traffic is lost to Southend, as there is only so much traffic that can go around! It also leaves LTN the only EZY base within the London Area without a railway station within the airport complex, and makes it even less attractive to for inbound passengers if they have a choice!