Thought this could be really usefull for some people who are travelling shortly -
'UK Government Requirements
From March 2009, as part of measures to ensure aviation safety and security Jet2.com is legally required to provide the UK Home Office with passport data for all passengers departing from and arriving into the UK. You are therefore required to provide Jet2.com with accurate passport data. You may provide this data anytime between the time of your booking and 5 hours before departure. Failure to provide accurate data may result in you being denied boarding.
You may enter the data via manage my booking on the Jet2.com website or via the call centre when making a new booking'
I had booked my flights in January & decided just to check them to make sure times hadn't changed or anything & spotted the above info. I hadn't had an email informing me but its a good job I checked as most people would arrive at the airport 2 hours before the flight by which time would be too late to submit your info as above.
Don't know if its just Jet2 that haven't emailed people yet but its not worth missing your holiday over!!
Hope this helps someone!!