London Repeats Offer of New Powers if Scotland Votes No

LONDON — With two days of fevered campaigning left before Scotland votes in a referendum on independence, the leaders of the three main British political parties renewed a pledge on Tuesday to grant Scots “extensive new powers” if they reject secession.

But proponents of independence seized on the pledge’s lack of specifics and on the recent differences among the three party leaders in their approach to the Scottish question to dismiss the appeal as empty rhetoric.