Well i see things have not changed much with air transat but glad that u was able to get on your way fairly quicky unlike me I had an 6 1/2 hr mechanical fault delay at Lgw.
Then on the rtn flight from Toronto another mechanical fault inside holding area for around 4hr then we was told the plane had to take off before midnight even with the ac/c fault as Toronto have a night time flight curfew so flew to Montreal was not allowed to deplane but stay on the plane as it was an a/c problem the engine had to be shut down and would not be so bad if it was winter but it was during summer time (one of the most hottest summer they had) there was lil childrens and elderlys along with 20 of my family members.

Even I felt i was gonna faint
Air Transat = Never again