Got done for sitting in first class once. Refused to pay the on the spot fine, stating that the train was running with 33% less carriages. Got a letter threatening to take take me court, produced a photo of the overcrowded train and explained a bit about health & safety etc, little bit more bullshit, gave them my solicitors details to send any further communication. My incident happened in October, not heard anything since! Sent all letters recorded delivery!