1) No. 2) No. 3) This sentence is talking about one specific occasion, but it doesn't necessarily mean that you have visited London only once.
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nkspbnever I am there, why doesn't it work with the Past Simple?Because past simple, without any modifying adverb of time, is used for a single completed action in the past.
nkspbThanks! I still wonder why using "was" cannot mean that I talk about any time I was there. We can say "When I am in London..." meaning whenever I am there, why doesn't it work with the Past Simple?English is strange in that the simple past is not an exact analog of the simple present. The aspect can change.