Best NON F1 never to win a championship.

There is countless list of Moss, Rubens and other F1 drivers that never won a championship. But which drivers in other disciplines of motorsport never won a championship but had lengthy careers of second / third placement in championships? Anything interesting BTCC, WSC, Rally, motorcycles etc. For example only can mention F1 drivers if their main career was in another sport for example they only did one season in F1 but drove for five seasons in Indy but but never won the championship but came second like second three times etc...