They were delivered in lined Brunswick with whiskers, although small yellow panels soon replaced the whiskers. Corporate all blue livery was next, and refurbished livery was carried by some when this work was done to the vehicles. Blue / grey then took over, and finally NSE livery.
These first two pictures of the Quaintonian at Quainton by Robert Frise illustrate two of the liveries carried. 51886 (above) was pictured on the 27/08/79 in all blue livery. The refurbished livery (below) is carried by 51653 (28/08/78).
The final image illustrates the blue / grey livery. Taken by Hamish Stevenson, it shows 51880 at Worcester 22/5/94.