My suggestion is the addition of a Caledonian sleeper livery for the class 87 and a sleeper variant of the mk3 coach. Maybe some talented modders could do this...
Think Just Trains need to be in the lead on this. Despite the excellent work done on WCML Over Shap and its stock pack, the representation of the overnight trains is incongruous at best. We need the Mk3 sleeping cars, which would normally work with Mark 2 aircon stock (which we are getting) or Mark 2C's.