There are a few mentions in the Caves and Karst of the Yorkshire Dales (Eds Waltham and Lowe, BCRA 2013) esp page 48, in the chapter that covers glaciation and quaternary evolution. Most of the recent work however relates to estimating age and denudation rates from pedestals rather than the origins of the boulders themselves. Some of the dating work is covered in the article linked by Bitterend. Caves and Karst of YD contains more references for this work as it sparked debate in the literature.