If London were to be safe at night, I would be going for walks at 23:00-00:00 every night. Unfortunately my friend and a friend of hers went for a walk in Morden (suburb of Greater London) at 1am once and was mugged by a couple of youths, and she came out with bruises. Morden is right next to where I live so I was quite scared by that. Also, I sometimes hear fights outside my house at night, and last time I ventured out (dangerously and foolishly) at night, I saw a group of youths vandalising a van.
Unfortunate as I like being out at night. If I still lived with my dad (or if he still lived in the country), I would ask him to take me out at night as he's over 180cm tall and weighs about 98kg; he does a lot of heavy weightlifitng in the gym too so not many people would try to attack him, or attack me when I'm with him! (Also, he was in the army a while ago!)
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I am a partially verbal classic autistic. I am a pharmacology student with full time support.