Seriously though - you're going to get stopped, probably violently, searched, and spend an afternoon at least down the station. Your name will probably go on some list, and everyone you know will be followed up. You may find it difficult to get jobs or loans in the future. Your flat will probably be searched thoroughly and all your neighbours will look at you a bit funny and be dying to dob you in for the next bomb. You might find coppers coming through your door at 2am next time there's a tip-off. Your family members will be investigated and their immigration status thoroughly checked. You'll be on security services' radar for the rest of your life.
That's if you don't get shot, of course.
Take a taxi.