@perennialloner,
The 'dropping of prepositions' is more frequent in U.S. English as opposed to British English. A particular example is the pair..
U.S. I will write you.
U.K. I will write to you.
The first would be considered aberrent in the U.K. but is normal in the U.S.
However, with the rise of Asian immigration in the UK. statements like "I am going London" are becoming more frequent in spoken language and are likely to enter mainstream in the future. After all, language is about 'appropriateness' rather than 'correctness', and what is 'acceptable' shifts like fashion in clothes or politica.