Cullen drew level with table-topper Ryan McLeish on 16 wins for the year following Irish Stryker success the previous week, but a lower average number of starters for those victories left him third.
However, after prevailing in a close Lotus Cortina scrap with his son Victor and Pete Chambers in the Historic Racing Drivers Club's Allstars series at Silverstone, that class win has now sent Cullen Sr to the top of the table.
