My thoughts,
EDI, JER nope unless BA see merit in a W rotation, DUB nope EI operate it, BHD, nope that would be an LHR/LCY route, CdG nope, VY operate it, ABZ nope, it worked at LGW when the oil/gas longhauls were at LGW like DFW and IAH but not now. CPH, ARN, OSL nope as they are LHR routes and head to head with Norwegian. ZRH is an LHR route, same for HAM, MUC, BSL, TLV, MXP, LIS, MAD. MAD is covered by IB Express, BCN covered by VY
i suspect a similar but smaller LGW operation to pre covid, leisure, mainly point to point and VFR focussed.
I think an important focus for the new subsidiary is flattening out the curve between summer peak and winter lull.
focussing Christmas markets, ski markets, Lapland and winter sun hopefully will be a focus. Anything and anywhere to stimulate demand in the traditionally leaner months of November, December (excluding Christmas) January and February.
I know BA last year did plan a few new routes from LHR that were heavily VFR focussed like Cluj etc, those heavy VFR routes could be useful to th3 LGW operation, especially post covid, other than that, to fill the leaner months,
the likes of SZG, INN, FDH, LYS, GNB, KTT, RVN, NUE, CGN?, LPA, TFS, ACE, FUE?, SSH, HRG etc and be creative, not every destination needs to be served for five months, like the Christmas markets, they were popular pre covid, target three or four of the biggest markets and serve the, say 10th Dec to 5th January
summer I’d expect traditional point to point leisure routes. With 17 a/c many ex LGW routes won’t operate or be from LHR. Any routes BA have found with good LHR longhaul feed figures will stay, I’d expect DBV to remain at LHR, as a hunch.