Combined my run with a trip to the polling station. It was about half way of a 5k.
The first 1k was tough as my knees are still ropey. But getting better. Got back into my stride by about the 2nd kilometre. Had to run across roads in order to get to the polling station, so my time was slow as I waited for traffic. But still below 31 minutes. If I keep doing 5ks over the next few weeks hopefully my knees will adjust if I walk around in my new trainers.