@DocBohn @cstross that's even more ridiculous than the time we had a ban put on travelling First Class.
There was some kind of offer on, and First was cheaper than standard. It also included lunch, wiping that expense off the claim altogether and saving more money. But the Powers That Be noticed that we plebs were having a nice time and banned it, immediately doubling our expense claims.
They also banned overnights, saving £50 on hotels and costing £100+ more on peak time trains.