My heart hopes for the best with the OP but my head fears for the worst. I'd have made every effort to get to AMS unless I saw MMB update with the journey beginning from LHR.

I have an ex-EU beginning next week, I've booked a fully flex Eurostar ticket to get me to BRU as backup in case my early morning flight the previous day is cancelled. Agree with richardwft, you need a Plan B and more, leaving yourself in the hands of BA is tempting fate a step too far in my opinion.