Originally Posted by corporate-wage-slave

In my opinion it's not worth the trouble. As mentioned upthread, BA are allowed to cancel flights due to bad weather, and then the new flight only has a delay compensation if it is 3 hours late, and 132 minutes is well short of that. The area where you have to consider further relates to your point that other services were running to Italy - you could argue that BA didn't try hard enough to avoid cancelling the first flight, and the onus is on BA to prove that.