Interconnect bag handling & check-in

2 questions really:
1. Have a MAN-LHR interconnect(on a VS UC ticket), if we check the bags in at MAN via BD, will we still get tagged for Priority off load at SYD..Or am I better routing to LHR and re-checking at UC desk [?] I'm erring on this latter option (reduces risk of LHR 'losing them')
2. Having a 'multiflight' itinery, I can't view my booking online, likely because system can't handle 6 legs. I've pre-allocated all our UC seats, but I assume the same would apply for trying to check-in online- i.e. it won't let me. VS have said as much over the phone.
Seat selection for us is critical as flying with mini NH. If I have to wait to get this confirmed at LHR on the day, is it likely someone could of 'nicked' our preferred seating arrangement online? [:(!]
Do you think its possible that we can strengthen our want of these seats, even prior to formal check-in. Has anyone had experience of this situation?
Ta
NH
1. Have a MAN-LHR interconnect(on a VS UC ticket), if we check the bags in at MAN via BD, will we still get tagged for Priority off load at SYD..Or am I better routing to LHR and re-checking at UC desk [?] I'm erring on this latter option (reduces risk of LHR 'losing them')
2. Having a 'multiflight' itinery, I can't view my booking online, likely because system can't handle 6 legs. I've pre-allocated all our UC seats, but I assume the same would apply for trying to check-in online- i.e. it won't let me. VS have said as much over the phone.
Seat selection for us is critical as flying with mini NH. If I have to wait to get this confirmed at LHR on the day, is it likely someone could of 'nicked' our preferred seating arrangement online? [:(!]
Do you think its possible that we can strengthen our want of these seats, even prior to formal check-in. Has anyone had experience of this situation?
Ta
NH