So I've just completed Wk9 R2 and it was a mental challenge the whole way. From the very beginning the gremlins were telling me that:
I didn't need to do this
I should take the day off
I felt ill (and I them did feel queasy - which passed as soon as I told them to shut up).
I could just walk for a little bit
Just turn off here and go back home - try it another day
You're tired - just walk
I fought them down the whole way around, kept going and did my 30 minute run, passing the 5K point by maybe 10 metres (so a little faster than my previous run when I did exactly 5K in the 30 minutes).
Those gremlins are a b*gger! :o)