It's hard to say. With most rule changes in the past, it's been specified that if someone had applied before the switchover, the case was completed under the old rules. I suppose you would need to try to track the exact piece of legislation, or even the discussion before it was passed, to see what the intention was. It's not quite the same as if, for instance, someone applied under SMC, which is all one visa, whereas going the business route involved getting LTBV on the strength of the business plan, and then being judged on the result of that before the residence visa was granted, so it's possible that INZ could argue for changing the rules on you between the two visas being all right (although it seems very unfair).
I see you have an immigration adviser - what does s/he say about all this?