Found some more info on A.net here.
Monday's slot is the BCN which will operate 5 x weekly instead of 6 and Thu and Fri is the
Early NCE flights slot which will mean NCE will operate 10 x weekly instead of 12.
Monday flight depart LCY at 09:15 and lands back at LCY at 14:25
Thursday and Friday flight departs LCY at 10:50 and lands back at LCY at at 15:35
Sunday flight departs LCY at 12:30 and lands back at LCY at 16:35
Leeds me to think there are zero slots available for BACF @ LCY and sacrifices have to be made to get these destinations up-and running.
I wasn't expecting we'd be trading NCE slots in cause they seem to be doing well.