Rather embarrassingly ('cos I got two colleagues to check before the prizegiving) I have made a mistake with adding up all the scores for the series.
In point of fact, Steve Light came third overall in the Open Class (289.885%) and Andy Simpson came fourth (289.828%).
I've chatted it over with both of them and Andy has very kindly agreed to pass 'his prize' to Steve when he next sees him. Apparently, I've got to buy each of them a coffee, a burger and a bun. They wanted more, but I need to pay for a new pair of glasses!