I can confirm that G-IGOC did infact ferry Luton to Bournemouth yesterday as "easyJet oscar charlie" and it also undertook a brief training sortie before heading to the coast using the same callsign.
Just to correct a technicality, the 'training sortie' was actually a pressurisation check at FL350.
It flew under the regn c/s, not EZY, as it ain't ours anymore. The crew were EZY though.