http://www.britishairways.com/cms/gl...ty-Airport.pdf
BA has some really inappropriate destinations from LCY, for example UIP, ANE, CMF, FLR, IBZ, MAH, PMI and GRX. If you don't recognise most of these IATA codes, then it proves my point. It's madness to drop ARN, as it is to exclude TXL, PRG and BCN for example. I don't understand how BA chooses its destinations from LCY; many of them would be more appropriate from LGW or more appealing to FR's clientèle.
So madness is dropping an underperforming route? Also, not everyone is geeky enough to know every IATA code, so, no, it doesn't prove your point at all