hey. its my first comic con. and i didnt want to miss out on a photoshoot with cumberbatch so i booked it to guarantee a ticket as if i waited for the schedual i would have missed out. now that the schedual is released im concerned as i am batch 25 on the saturday but i need to leave at around 5:15 for my 6pm train back to sheffield. is there anything that can be done? as i dont want to waste my £76 or purchase another train ticket. please help.