Racking my brains here, normally the dispatcher advises the crew about the cargo before the final fuel figure is calculated for the estimated ZFW in order to avoid any last minute issues. I can't think of any occasions of denying pax, left baggage behind in the past, but not PAX, except when overbooked or families can't be seated according to the requirements e.g UMs or special assistance.
By the way, most LGW LH destinations are being advertised from 2nd Qtr, doesn't mean we will fly again.