Agree with the above, and agree about the m 4 too if your coming from Bristol at rush hour, came back from London once on a Friday evening the night before wales v England , mile tail back at the toll and the que for the bryn glass tunnel in Newport started about 100 yard past the toll, never seen so many flash cars and range rovers with large men in white rugby shirts in my life and unless I ever go to a wales , England rugby match , I never will, left London at about 1.30 pm, got home ( cardiff ) at about 10. 30 pm, timeing is everything.