After finishing school at 12:00pm and with a hill at the end of the street, I did the first of Pete Magill's suggested short hill repeats. Whereas his long hills are run by 'distance', short hill repeats are run according to time. So, for a start......
8 x 30 seconds at about 95% effort
Jog down. Wait 4-5 mins.
I don't think the hill I used was steep enough. The one at Parkrun would be ideal....maybe next time!