Well, that explains the appearance in the BA.com destinations menu right enough!
This is a good match. For Cityflyer, they find a weekend home for their aircraft outside LCY that doesn't involve a battle on price against Ryanair, Jet2, easyJet & others as the weekend operations at STN and MAN did. For SOU, they get the weekend leisure flying covered with a very credible carrier and even if that airline isn't paying much at SOU, the volume going through the airport and generating spend is good. The local perception of having BA flying from SOU is also a major boost and having these routes back on the map (and some new ones too) is a real plus.
I view it as good news in the most diabolical of times and I'm not inclined to agree with the views of those of a negative disposition towards it.