Went to Cardiff yesterday. Was an HST as correctly predicted. Was busier than I expected it to be. When I first got on and saw how busy it was, I almost got off and waited for the next service to Cardiff which would have been a Turbo probably. But I managed to find a window seat facing the direction of travel(not really a fan of backwards facing seats!) and two seats to myself. But with the high backed seats, it felt like I was in a little cubicle!(I do miss the old HST seating and carriage interiors!) Arrived at Cardiff Central, and oh my god...... the bus station and all those shops are all gone! And in it's place a massive new office block! I couldn't believe it! Got the 1500 service back to Bristol which was a Turbo calling at Newport, Severn Tunnel Junction, Patchway, Pilning(possibly the first time I've been on a service that has stopped at this station!) and Filton Abbey Wood. With the lower backed seats meaning I didn't feel like I was in a little cubicle, and I could see down the carriage! And it wasn't very busy. To be honest, I enjoyed the Turbo journey back more than the HST journey there.
Looking forward to two journeys on an IET between Bristol and London in July though.