Well I just somewhat unexpectedly received 250 SCs when my second month of 25K points hit from the Virgin Money card. Clearly the card was opened well before the promotion started so shouldn't have been eligible. I suspect the true answer to when the bonus will post is "the first instance of 25K points to hit your VFF account after choosing your bonus".
[USER=85957]@Spp[/USER] did your month 3 hit yet and did you get your selected bonus?
My guess would be that from a technical and legal/privacy perspective, given that the bonus is applied by VFF and not the bank, it was probably too hard to set up any kind of link to communicate back to VFF about when you opened the card. So they went for a much simpler solution of "if a transaction hits the account with a particular description and/or points value after they select their bonus, credit their selected bonus". A fringe benefit of the fact that the Virgin Money cards pay out in 4 instalments rather than one hit.
This may also explain the vagueness in the ts&cs around when the card account needs to be opened.
Personally very happy with this unexpected bonus: with upcoming flying I have booked should now requal for WP rather than dropping down to gold.