Bit of an interesting one just spotted on the live updates.
1730 Cardiff Central-Portsmouth Harbour
16 April 2011
This train has been further delayed and is now 34 minutes late from Bristol Temple Meads.This train has been revised.It will no longer call at: Bath Spa, Bradford-On-Avon, Trowbridge, Westbury, Warminster, Salisbury and Romsey.This is due to disruptive passengers
Whilst the disruptive passengers sounds a bit of a nuisance to anyone on the train at that time, a Bristol-Southampton non-stop run would be quite a novelty/rarity!