SEN enroute tech stops.
A 100kt jetstream from the southwest lay (exactly) along the TFS and FAO routes last week. Inclement wx was also present at these destinations. Hence the TFS stopped in Bournemouth on Saturday and the FAO stopped in Stansted on Friday to take on more fuel.
The fire did indeed preclude the use of RWY 06 for departures on Saturday morning until approximately 0800z. The FAO on Friday was too heavy for either RWY.
A "perfect storm" of weather situations at departure, enroute and destination meant the aircraft could lift the necessary fuel and payload from SEN. Thankfully quite rare when compared to the total number of EZY SEN departures.