Nicci,
While I and others will no doubt continue to post our frustrations, I hope you know we fully appreciate your communication. I hope nothing comes off as directed at you personally.
Thanks!

Edited to add a follow up question/comment:

On the calculator. If this is going to be the dispositive way of calculating miles, some additional options or flexibility will need to be built in for complete clarity. For example:

Entering HEL-CDG into the calculator returns a required Avios of 10,000 one way in Y. However, this obviously must only be for the HEL-CDG direct flight offered by FinAir, correct? As I understood it HEL-LHR-CDG would be the sum of HEL-LHR (7500 Avios) + LHR-CDG (4500 Avois) = 12,000. Note, confusion is compounded by the fact that the calculator does indicate the mileage listed is good for BA only flights "with up to one connection" (so, if I used the calculator, I'd expect the 10,000 to be the correct mileage for either a direct FinAir flight or a fBA flight with a single connection in LHR...and I'd also expect to get my free stopover in LHR as well. :-D )

Can you clarify?

I think this is the same issue peterrabbit identified with TXL routings.