UBS as an investor and as an advisor are two different things. As any airline employee will know, one company can do two different things, doing one very well and one rather badly!
My guess is that, if LH take over, it is too early to call. On the one hand, they are a cautious company that do not move quickly into new things. On the other hand, it is a time of rapidly changing times in the airline world. Further, the forthcoming recession will change the fortunes of all carriers. Doubtless there are those who know the route networks inside out and can advise on overlaps but, I think we may be sure that the EGLL slots are the jewel in the crown.
For Sir Michael it appears to be, "Any purchaser, as long as they are not British."