Quotation marks are not used for extended quotations introduced by a colon

English as a Second Language English Vocabulary, Grammar and Idioms
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Rule 8. For extended quotations introduced by a colon, some style manuals say to indent one-half inch on both the left and right margins; others say to indent only on the left margin. Quotation marks are not used.

Example: The author of Touched, Jane Straus, wrote in the first chapter:

Georgia went back to her bed and stared at the intricate patterns of burned moth wings in the translucent glass of the overhead light. Her father was in “hyper mode” again where nothing could calm him down.

Do the British follow the above rule? I believe, in British English, quotation marks are needed, but indentation (I could not indent the quotation) is not necessary. Correct me if I am wrong.

Thanks.

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You needn’t use quotation marks for what may be written after a colon. However, if it is written after a comma, they are necessary.
It is better to indent both the margins whether you let the text remain left-aligned or justified.

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