Clifton Suspension Bridge, connecting to Bristol. On wiki it says the clearance below is 75m, and the total height is 101m. It has barriers installed, which again according to wiki has halved but not eliminated suicides. But I don't know what the survival rate is for those who have jumped, nor what the barriers look like. Advantage is that it's open to pedestrians and cyclists as well as vehicles and well accessible from most of England.
