The same goes for Guernsey (although BAW & EZY don't operate there). I could envisage up to 4 flights a day to LHR , with an appropriate reduction in LGW services. Although, I don't think BAW or EZY would have much interest in Guernsey without a R/W extension.
Hm... Aurigny is doing LGW on E9
5, so I hesitate to agree BA not serving LCY on E9
0 would be on tech grounds...