I've read the above several times over and I'm still trying to work it out.

Were you IDBed? Then claim (you don't claim an amount by the way, you assume FI will get that right). If so how long were you delayed compared to your original schedule? And was that rebooked service late separately to the IDB issue? And was anything cancelled in the middle of this? As noted at the top of this thread, for the purposes of this thread you can regard Glasgow as being in the EU.