BA are not going to touch Knock, simply the slots are too precious and they will feel London/Knock well enough served. Yes they would be more interested in longhaul feed, but there is limited point to point, and it's price sensitive, so in short I think not a hope until a new runway/airport for London is built. I would see Cork and then Shannon, in that order as the next Irish airports to be served if they have the appetite, but cant see it happening unless the arrangements with Aer Lingus go really sour.