This is the state of GB Airbus fleet, from EasyJets Transition outline.
9 x A320s (8 operating lease, 1 sale and leaseback),
6 x A321s (2 sale and leaseback, 4 debt financed),
5 deliveries between June 08 and October 09.
So when the flights start under the orange brand at the end of March they will only have a max of 14 aircraft from GB, as one A321 will leave in Feb 08.
Here is part of the last set of results.
"Based upon its statutory accounts under UK GAAP for the year ended 31 March 2007, GB Airways reported profit before tax of £2.6 million and EBITDAR of £35 million on revenues of £250 million; it carried 2.8 million passengers; had gross assets of £182 million and net assets of £33 million".