Photo was by NW Sprinks taken in May 1953 of loco 43 at Ballymoney. This appeared in Steam Days May 2014 and shows clearly the UT crest applied on top of the middle C! There are photos of same loco in July 1954 in NG in Colour book but angle is less clear
There is a good photo of 43 in July 1949 in smart NCC livery in latest version of Ballycastle Railway. Same book has clear photos of 41 and 44 in UT livery in 1950 with no NCC markings at all.