I did see this mentioned on a FGW▸ (First Great Western) poster which highlighted all the main changes taking place at the May TT change.
End of an era in a way when back in the seventies Cardiff-Portsmouth services (most of which started at Bristol) used to serve most of the shacks between Salisbury-Portsmouth making it quite a long journey of 3 hours if you were travelling to Portsmouth from Bristol compared with a journey time of around 2 1/2 hours today.