Conversation with self went like this:
"You haven't run since Monday, so you're due a run..."
"Yeah, but I overslept, and I won't want to go this evening because of reasons"
"True, and you haven't done any rest day exercise either and you know the way you sit is bad for your knees, maybe you should do a bit of yoga"
"oh hmm.. but I want to run"
... wait what? I really want to run?
"Week 9, though. It's surprisingly hot out and that lack of exercise might be catching up with you"
"If you leave it any more 'rest days' that habit won't be forming as well"
"Ok, how about... a 20 minute jog round the park before lunch?"
"Ok, Week 9 can start on Saturday, when I feel more prepared"
"WAIT HAVE A DRINK ... oh, she's gone.."
So I went for my jog, bit dehydrated (will be more careful normally, honest), and now I can really say I'm one of those people who "goes for a run at lunchtime", and after this post I will be ready to attack an afternoon's work, clearheaded.
Also I tested out a nifty bit of kit - having whined about how I'm so short and sports bra straps aren't adjustable enough, I found this - thestrapsaver.com/. It's amazing and the ladies who invented and sell it are fabulous. Their phone number spells out BOOB-FIX. I love them.
I also went back to regular socks, because those nice cushioned sports socks just become really sweaty cushions, which was just weird, and I thought I'd see if I was imagining it but no, I think I'm slightly more comfortable in regular socks for now.
Right, back to work!