Great Western Coffee Shop

Sleeper package fares (berth & travel) have been withdrawn  :'( , you now need a supplement together with normal walk up tickets. The supplement pricing will vary according to demand, previously this was  a fixed price for either solo or twin cabin occupancy.

I've just had a play with GWR's slightly confusing booking website. Initially it looks (to me at least) as though it's showing combined prices for ticket plus supplement as there is a box saying "You have selected an overnight sleeper", but the next page generously tells you that there is no extra cost for a standard seat and gives the option of adding a sleeper berth. So far I've found berth prices between £45 and £60 in the next few weeks, but no way to get an overview of prices on all dates to let someone who is flexible about travel dates see and pick a cheap day.  Less than ideal, though I suppose no different from the lack of transparency when buying Advance tickets.  Only way seems to be trial and error, with a bit of second-guessing when fewer people might be travelling by avoiding Mon and Fri, BH weekends and school hols.

With the old pricing on GWR mixing desk you could easily click next day to see if any better Advance package available.