I have a good understanding of consol fares with BA and cannot comprehend how such a fare differential is possible on a like for like fare. It may well be an error, an IT fare sold erroneously as SO, or a very very very small chance of it being a group booking (i.e no chance). POS I'd struggle to see much variety.
Basically BA would be interested and investigate - they would / should check in case of a deliberate error (airlines rightly very strict on IT fares sold as Seat Only and I've seen companies losing their ticketing plates).
I very much doubt you'd get it matched.