I tend to avoid the 800s where possible and look for HSTs instead, the seats are beyond abominable and give me a numb backside somewhere between Reading and Swindon on the way out of London. No buffet car either - ridiculous. I know there's a trolley (possibly, no guarantee) but if I want food or drink on a train I want to go and get it when I want it, not when the trolley decides to turn up to me.
I am however very pleased to know that Pullman dining will still be available on GWR, until I read the last few pages of this thread I had assumed it was going the same way as all other "comforts" on the British railway - ie being abolished. I will be sure to avail myself of it on my next trip.
PS. Re seats, was on an LO 317/7 on the Chingford line today and the attached shows the type of seat that an Intercity should aspire to (and these units were only Stansted Express formerly, if I recall correctly, max 1hr journey or less?)
Take note GWR or DfT (don't really care which is responsible - my backside is still numb either way) - THIS is what a train seat should look like...