Many thanks to the 11min/mile pacer starting at the blue start. I was doing well untill about 19 to 20 mile mark and then I hit the wall, well I think it was. My legs went solid and could hardly move them, but I had another sachet of Lucozade Sport and after about a half mile or so my legs returned to my control but not at the same speed. I finished on 4hrs 51 min, not bad for my first attempt.
Will try harder next year.