Welcome Jez, I'm quite familiar to the area after travelling to Cardiff Bay several times with friends and know how busy it can get on the Bristol-Newport section...and travelling through the Severn Tunnel on a class 142 train is never a good idea! I hope you enjoy your time here

Thanks for the welcome. I think the only trains that now go through the severn tunnel are
FGW▸ ones (apart from the occasional Cross Country service). I remember the days when
ATW▸ used to run services through the tunnel and down to Bristol, Taunton and as far as Penzance. That only changed with the December 2006 timetable but im not sure why.