Just read on the Telegraph website that Ryanair's website will be closed for maintenance between 10pm on Friday until midnight on Saturday, which has implications for people wishing to print off boarding passes. According to the Telegraph:
The budget airline’s website will be closed for maintenance from 10pm on Friday until midnight on Saturday, meaning passengers will be unable to print off their boarding passes.
It is a condition of flying with Ryanair that all passengers print their own boarding passes. This can be done no earlier than 15 days and no later than four hours before the scheduled departure time.
The airline charges passengers £60 per person to issue them with a boarding pass at the airport.
It said it will be contacting passengers by email, and advised anyone due to fly on Saturday or Sunday to check in online before 4pm on Friday.