Actually, the use of And as the starting word in a sentence was quite wide spread up until three centuries ago in the UK. Like I said it is a conjunctive when used in this fashion. It is only used to provide extra emphasis to your previous sentence. It should not be used to provide another point of interest. It was widely frowned upon when I was at school, however after reading numerous law texts at Uni and having a brush up on gramma I discovered that many of the hard and fast rules at school were in fact incorrectly applied. They are only guide lines. Furthermore the use of But is strongly discouraged and I have to say that it should never be used to start a sentence. There are other better words to use; such as however or conversely.
If you are interested, keep an ear open during nightly news broadcasts for the incorrect use of the word "was". It should only be used as It was or there was. It should not be used in places where the word "where" should be used. This frequently happens. Most irritating.
Anyway, there you go.
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