Oh, okay. So if you had flown the IB routing that UX had put you on, that would have gotten you to LON without a major delay? The timing of delays, as you are probably well aware, has a lot to do with the EU compensation rules. See the aforementioned PDF and the link below for clarification:

Frequently Asked Questions about Air Passengers' Rights in the European Union

I'm going through a similar process right now, so I've had to do my homework on this.

Oh, and welcome to FlyerTalk!