Dr Andrew Walker, an expert in health economics at Glasgow University, highlighted the problem in a report on hospital-acquired infections (HAIs).

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According to the testimony, Brothers applied to be a "64, 000 Question" contestant as an expert in home economics and psychology.

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But Stefan Szymanski, an expert in sports economics from the University of Michigan, told the BBC that even with the lower share price, Manchester United is still "the most valuable sports franchise in the world, and the American investors are looking at this as a franchise".

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"An outflow of immigrants, or a reduction in the inflow, could actually lessen the recessionary pressures, " writes professor George Borjas, an expert on labor economics at Harvard University, in an e-mail.

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Sharon L. Poczter is an expert in emerging markets, financial economics, industrial competitiveness and strategy.

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Prof Kemp, an expert in North Sea oil and gas exploration economics, also said devolving tax policies would create the complicated situation of separate taxation regimes in Scottish and the rest of the UK's waters.

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