the VS source website might have info but delays are caused by numerous issues nt just technical.
Even a non 'challenge' tech issue can take a while to fix as it is checked and the paperwork completed that says part A was replaced with B with a serial number of C carried out by person D and checked by E and pilot F
+ weather
+ delayed inbound
+ delayed crew
+ airport restrictions - both at LGW and MCO - if there is an issue at MCO they won't let it leave LGW until it's resolved
+ delayed passengers
+ problems loading bags / cargo / catering
+ passenger boards then decides to not fly so the bags have to be found etc
+ ATC
Huzzah for International Jet-setting !