I was on the MAN-BUD inbound leg of this rotation. We left MAN around an hour and a half late. Before takeoff the F/O made an announcement apologising for the delay. He stated that the outbound flight had to be cancelled because the original operating crew would have exceeded their maximum flight duty hours for the day by the time they arrived back in BUD.
Classic Ryanair. Blaming everyone but themselves!
(P.s. Oddly enough, it was this trip which caused me the payment problems I described a few posts ago).