I'm going with the same opinion I had in the european game this week. Contact from Robertson on Wellbeck? Yes. Pen? No. He was taking the ball away from the net, he had no control of it, and it had no impact on the play (Wellbeck taking two steps and then flopping was pretty funny, too).
I really wish there was a bigger use of indirect free kicks in the box for obvious non-scoring opportunities. I'm not going to complain about the other things as that's how they've been implemented for everyone; if you are fractionally offside you are offside. Nothing really to complain about there; I am all for favouring the defensive players in these situations given how many rules have been introduced to favour the offensive side.
EDIT: I was wrong above, it was actually the Brighton game last week (MW9) where March made contact and I called it no pen, not a midweek game.