Thanks for your suggestions. I tried to Revise from the drop down menu on my Active page but there's nothing there to change duration.

I went to the bottom of the listings and chose Edit for both listings. Edited the Duration from 30 days to 10 days and got a green message saying '2 listing not updated'. Tried again and still didn't happen.

I've never used the Seller Hub but I might go and have a look around.

I know I will not be using the new listing format again any time soon!