I've been given a date and time (Monday, 1330 hrs) that I must attend $PRESERVED_RAILWAY to be assessed in the post of Signalman. If all goes well, I can drop the word "Trainee" when I answer the phone.
I can get there and back in the day. No need to book the sleeper. (Prolly a bit late to book now anyway, as it's August and everyfink.)