This topic (and quite a few similar) regularly arises on PPRuNe. Suggest that a search on "critical engine", "Vmcg", and "Vmc" (or "Vmca") will give you more than a coffee's worth of reading.
Certification things of interest are
(a) directional control characteristics
(b) loss of systems
while the typical interview question tends to relate to the crosswind consideration (which, basically, is ignored at certification). The thing to keep in mind here is that Vmcg is determined for nil wind (7 kt under the UK requirements) ... if you happen to be in a critical takeoff situation, with a decent crosswind ... then don't have an engine failure.