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EDINBURGH — Revenues from Britain’s oil over the next 30 years could be around 25 percent less than previously predicted, the UK’s independent budget office said on Thursday, delivering a blow to Scotland’s campaign for independence.

The Office for Budget Responsibility said in an annual report that since last year predicted combined revenues for the six years from 2013-14 to 2018-19 had been revised down by 8-billion pounds (US$13.6-billion).

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Expected revenues also for the period 2019-20 to 2040-41 have been cut to 39.3-billion pounds, down 12.6-billion from the OBR’s estimate last year.

The vast majority of the UK’s offshore oil lies off Scotland, and separatists cite substantial income from North Sea oil as a cornerstone of their plans.

The latest polls show that the campaign supporting independence has lost momentum, however, with concerns over the economy a major issue for voters as they consider whether to end Scotland’s 307-year union with England in a referendum on Sept 18.