Read H.C.H. Burgess's 'Working with LMS Steam'. He was a fitter at Swansea Paxton Street shed and describes the Cadbury's excursions from South Wales to Bourneville for the benefit of their sales people, using Super Ds as motive power. Then the WR took over, decided that a D wasn't appropriate and sent a Hall. By the time the train arrived at Bourneville it was time to leave again. Although the people did travel there the following year, they never again went by train.