This took place in August. Here’s the takeaway from a piece in the Guardian: “The Department for Transport (DfT) confirmed that the incident took place but said it did not believe the missile was an attempt to target the British plane, instead ascribing the missile seen by the Thomson pilots to Egyptian military manoeuvres.”
My guess, the shooter missed the target. A pilot could not maneuver that size plane that quickly to avoid the plane being hit.