It is possible to plan all sorts of train, bus,coach and combined travel in
Wales on the
http://www.traveline-cymru.org.uk/ web site. There is an
overall UK site
www.traveline.org.uk
It has a few bizarre features because of idiosyncratic names for
destinations and bus stops. For example to find a journey from Swansea bus
station you have to use 'quadrant bay' as the location. However it does the
job.
Jeff