EGAC
Epsomdog might actually be on to something if looked at from another direction. EI take those slots and ultimately IAG get the go ahead with the buyout, BA could operate those services on behalf of EI freeing up their own slots for LHR expansion without affecting DUB-LHR frequencies. Kills two birds with one stone, frequency stays as is on BA's EDI/ABZ/MAN and the slots lost to VS effectively make their way back to BA.
The advantage EI have, is they are already up and running. BA, I assume would need to find extra aircraft (over and above their existing ones on the routes) and crews to operate the additional services. Of course they could hire EI to do it for them