After your post about run/walk timings the other day, I tried your 60secs/30secs ratio this morning instead of my normal 2 mins/1min. Although it felt a bit strange to get used to at first, I have just recorded my third fastest 5k time - and that includes those where I have run all the way!
I don't know why it should make a difference given that the proportion of running and walking is the same. Perhaps it was just a good run this morning?
I will try it again later this week to see whether it was just a flash in the pan. Thanks for the suggestion - it's always good to mix it up a bit!