The 6B71 Tunstead to Northampton Castle Yard is not a working that I have many images of as it arrives from the north and I am south of Northampton. When it ran as 6M92 Andy I caught it between Crewe and Stafford back during the Covid year of 2021, see....
https://www.ontheupfast.com/p/21936chg/30018777695/x66757-09-15-tunstead-northampton Today 66705 is hauling the train and is seen passing Caithorn a short distance north-west of Rugby on the Trent Valey route.