After three days without running, due to lots of post-holiday work-related stuff and life admin, I decided I'd better get out this morning while it was cool. I thought I'd just do 4k on an easy route, with 30m elevation rather than 65m+.
I started too fast, but as I felt comfortable I didn't slow up much. At 3k I realised a sub-30 min 5k was possible, and as it was still on at 4k I went for it.
My previous best 5K time was 31:19, so I was utterly gobsmacked to achieve 5k in 28:52!