I have no intention to wum this board, but I do feel constrained to make a point in the ref's defence.
It a player makes a tackle with both feet off the ground and with studs showing, it is an automatic red card. Therefore, for that decision, the ref was correct. In order to win his appeal, Kompany will have to get the commission to accept that the ref made an "obvious" mistake in issuing a red card. In this instance, it is clearly the case that the ref had, at the very least, some justification for issuing a red card; therefore, it cannot be said that he made an obvious mistake, and the appeal is bound to fail.
As a Spurs fan, I have absolutely no wish to defend Foy for his inept officiating, given his appalling decisions that cost us our game against Stoke, and there is no doubting that he made some very bad decisions in the Manchester cup game, including the penalty that he should have awarded to United, but I truly believe he got Kompany's sending-off correct.