I’ve made good use of this personally, using the 60, 30 or 14 day options depending on what it’s for - check the pricing for your flexibility option and see if it works for you.

it’s economy only, and 10TPs per sector.

There are quite a few threads on this already, this one seems to be the most extensive:

https://www.flyertalk.com/forum/brit...t-pass-17.html