Originally Posted by
blindman
Limited to 355 from the start of the trip or from when I booked?
If your flight isn't cancelled by BA, then you can apply for an FTV which lasts until April 2022, all travel completed by the end of April 2022. However this current booking has to be booked so that the trip ends before the end of August 2021 as things stand. If you keep it at June for now, as you are proposing, but apply for an FTV that would allow you to move it for the fare difference until April 2022.
Proceed wih caution - are you completely sure you can travel in June 2021? If it's London to Frankfurt then that's probably going to work. If it's London to Sydney it almost certainly will not work.