You are again spending money that no-one has in (a) developing Church Fenton to be better than LBA and (b) closing LBA down. After all, you are going to compensate all interested parties at LBA, aren't you?
Don't forget, as Leeds Approach said in the CF thread, he is not interested in economics.
He just wants the big shiny airport parachuted in with no care for cost, and all of those airlines to flock in with complete disregard for any yield and load potential.
In other words, LA wants Changi in Yorkshire.