LondonAndy - you certainly may.
Happy, healthy, and prosperous New Decade to everyone here - lurkers and active posters.
I am not sure how long I would have made it without the new valve. I got mine when I was 41 - for all I know, I may have just slowed down, and down, and further down, until my heart exploded or I had no energy left. I'm glad I didn't have to find out.