In the U.S. there are now at least 20, 000 informal remittance businesses working out of 24-hour convenience stores, restaurants and small shops.

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But the opt-out that we have now means you can only work longer hours if you choose to opt out of the 48-hour working week.

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In addition, research suggests that consuming lean protein 15 to 20 minutes before, during and within one hour of working out may help improve muscle gain.

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The Trades Union Congress says Britain's policy of allowing companies to opt-out of the European Union Working Time Directive, meaning people to work over the 48-hour a week limit on a "voluntary" basis, meant the protection it offered could be circumvented.

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