Easy accessibility near river & docks. Best done late night to give hours before discovery. Would need to trap self underwater - instinctive sense of survival prevents self drowning. 5 - 10 minutes. Likely to panic during drowning.
Effective provided using right combinations. Limited access. Would need to plan and stockpile over time. Illegal drugs easy to obtain but would be stressful whilst experiencing overdose. Prescription drugs harder to obtain but can construct more relaxed methods
Tried and failed, although method was accurate. Very relaxed and pleasant method if done effectively. Experience teaches me there is no panic at all for me using this method.
Requires suitable hanging point which is strong enough. Ideally requires long enough drop to break neck. Required drop for 8st mass is ~14ft. Plus 5ft height. Plus 5ft for fixing point/excess drop = 25ft vertical space required. Death by asphyxiation is also possible and effective, but takes longer and likely stressful during experience
High speed collision:
Easy access to car. Car safety features may reduce to serious injuries. Impact in excess of 100mph required for probable mortality. Collision with other traffic would double relative speed of impact but endangers others unfairly. Fairly instantaneous with sufficient impact.
Approx 30% mortality rate. Not effective enough. More likely to cause serious injuries. 11am most popular time. Mid day likely to cause less inconvenience to others. Would need to study probably locations in advance. Overground blind corners at high speed best.
Jumping from building:
Generally effective over 10 stories. Messy. Traumatic upon others if done during day. Access to buildings with jump points may be an issue, especially at night. Only time of fall to panic during. Likely to be less than 10 secs
Would need to get to bridge. Mortality rate generally very high. Impact plus water means drowning often causes death if neck not broken upon impact. London Bridges not high enough & current not strong enough. Most personally desirable locations in USA - would require planning and money. Only time of fall to panic during. Likely to be less than 10 secs
There are many other methods, effective and available - it's fairly easy to gas yourself with household cleaning products or to make potassium cyanide gas using your home oven, both of which would be relatively easy ways to go (though the cleaning products method results in horrible respiratory pain whilst you asphyxiate), but the above ones are the major options.