Managed W5R1 this morning despite the fact that my stupid earphones kept popping out every couple of minutes! My ears must be a peculiar shape or something.
Anyway, I've now ordered some on-ear headphones as recommended by RainbowC yesterday. Thanks RainbowC!
Perhaps the headphone shenanigans distracted me from the fact that I had to do three 5-minute runs! Was quite tough but I felt that the third run was actually easier than the second. Mind you, I was slow and steady.
Onwards and upwards. Or, as in my case, onwards and running on the flat wherever possible!