Ah, but would you have eaten those biscuits normally? If so - then it doesn't matter! Because you've still burnt 450 calories than you would have done had you not gone to the gym. I went too today! Only burnt 200 but i'm focusing on the leg extensions (ahahaha)
It just needs advertising a bit better. It's never open when they say it is so it's pretty much pot luck if you want to go in there. Maybe if they showed some live sport a bit more often as I'd rather go there to watch a game than go all the way up to the stags.