I remember having 58013 on a rake of mark 3s in 1989. Also a few 47/0 or 47/3s turned up that year; even had a pair of 31s! Think they didn't drag, the diesel worked Wolverhampton to Nuneaton where loco was changed for an electric.
31/4 has the standard ETS index of 66, so is fine on mk3s apart from the lack of traction power - hence pairs on longer trains.