alasdair1
The easyjet release dates are published on their website and asking for inside information is probably a total waste of time as others have said before me as they simply won't know.
"Autumn 2016" is the main summer 2017 release date.
Flight schedule release dates | easyJet
As edi_local has stated if you employer is really that unreasonable bite the bullet and book Turkish as soon as they release the flights which is usually 330 days prior to departure although in theory it will be 330 days from the date you want to come back.
Prices are not cheap at around £273-300 each return (July 2017) which is the best I can find.
Pete