I can confirm all the RAF Chipmunks had carb heat wired hot. We had 37 of them at South Cerney (36 after the BeBe Sharman/Ritzi event), but only 30 were used during the launching as the first was queuing up for it's second launch before the last had gone, and more just got in the way. After launching all 54 Standard Class gliders in 13 minutes early in the Competition, the launch team were asked to slow down to 20 second intervals as the dropping zone was too congested.
Re site checks at HusBos nationals, my first launch there was on the first Comp day on the Nationals, and although I had to produce my logbook as currency evidence, nobody invited me to be site checked. Maybe a glance at the logbook indicated I was too dangerous to fly with?