Originally Posted by
LukasVIE
I don't think that you have to worry about that! I THINK I've heard that if they cancel your flight, they MIGHT put you in economy, but that is very unlikely. You will have a seat assignment in the first class cabin and the 180 TP are a real bargain compared to a BA First flight

I've found posting of TPs to be excellent.
On a cancelled flight last year, I had no problem with a transfer to another flight and foudn this happened before I even inquired with the airline. TPs also posted on this occasion. They lost my bag however.....