Aircraft being flown by Saudi to Manchester is B77L
JUBILEE
You do realise that's just an internal Saudia code for their three class (Yes includes a First offering) 777's
The aircraft are nothing other than standard 777-268ER models and in the range HZ-AKA to HZ-AKK (excluding HZ-AKF) and have been deployed on European services for nearly 15 years.
Don't confuse them with the more typical use of the code for the 777LR
version !