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The organisation said parents needed to talk to their children about the issue.

After those record lows, it should be around 62 on Friday - which is still some 20 degrees below normal - before sliding back into the mid-40s. Saturday will be 70; Sunday, a few degrees above that.

However, an influential and vocal section of Cameron's party dreams of Britain having a similar relationship with the EU to that of Switzerland or Norway - a free trade agreement which gives access to the EU's huge single market without signing up to what they see as a costly and burdensome bureaucracy.

There are also special gadgets that enhance athletes' lung capacity, improve transport of oxygen and speed up recovery.