I agree. My example above was not a good one because the dual pass through LHR with MRU was technically not allowed under the rules because it did not fit under the Africa exception.

There is a difference, though, in what is allowable under the rules and what MB-MRU will ticket. . My experience last summer with BA-MRU is that they did not understand various rule exceptions and interpretations and tended to refuse to ticket them (or submit them for checking). In talking with them in person last month, they are very concerned that if they do agree to something unusual, even if it slips by the BA-RTW desk, if it later is proved to be impermissible, then they suffer consequences. I don't know why they should, but this was a real concern. Hence their extreme risk aversion.