The fund has a good track record of out-performing its net asset value return in strong market years and fund management has been a consistent buyer of shares (currently holding around a third of all shares outstanding).

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And note that the Invesco fund trades at a 15.6% discount to net asset value, taking some of the sting out of its higher expenses.

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Analyst Fustier points out that BP trades at a 22% discount to net asset value, compared with only a slightly narrower 19% discount for the other supermajors.

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"If you wanted to get out on that day, you could only do it at a discount to net asset value, " says Sonya Morris, an analyst with fund tracker Morningstar.

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By another gauge, though, U.K. REITs aren't as pricey as you'd think: the stock price versus net asset value, which is the worth of a property portfolio after debt is taken out.

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