Originally Posted by TerryK
Bottom line: yes, it is possible. But you need to be convincing and/or to get a dumb BA agent at LHR office.
I just thought that booking MRU-LHR in UK will raise suspicion about the true intentions immediately, while booking LHR-MRU-LHR will go through easier at the beginning. And then, there are always good reasons for ticketing outside, like: "It's a birthday present for me from my grandma living in Mauritius and she wants to pay in cash over there."