Only 30 more years to go!
I think you'd win under the bingo formula Prue. Over all the races in the series throw away the minutes and look at the seconds. The winner has the most different values. Ack to Lower Hutt Parkrun. (Well maybe they stole it off someone else:-))
We already have another handicap formula at work in our club - the finish split race - where our finish split times are taken and a handicap applied. However, regardless of whether l go fast or slow, somehow l always appear near the bottom of the list.