I think that once you have issued easyJet with your references list you are not allowed to change that list - but I can not swear on that, you could always contact the id department using the same email address that you would have sent your references list to to clarify.
I can not say either way whether you are "screwed" or not, that is why I say honesty is the best policy. Just keep your fingers crossed and keep the company informed of what happened in your old job and fingers crossed everything will work out for you.