Diary: Nabs walkers do their bit to water High Atlas

A word of warning for anybody thinking of signing up for next year's proposed sponsored trek across the Sahara - it is not for the weak-kneed (or weak-bladdered). Eleven of adland's finest have just returned to Blighty after slogging 60 miles across one of the world's remotest regions, the Central High Atlas Mountains in Morocco. The good news is they expect to raise more than £30,000 for the industry charity Nabs. The bad news is they have all had to learn how to hold their drink in a very uncomfortable way.

The problem is altitude sickness, which can only be avoided by guzzling at least four litres of water a day. As Douglas McArthur, the chief executive of the Radio Advertising Bureau and one of the organisers, explains, that's not a problem during the day when the temperature is in the mid-70s.

The trouble comes at night when you're tucked up in your sleeping bag and dying for a pee when it's minus seven outside the tent.

It was all too disorientating for Emap's Helen Robinson, whose need for constant comfort breaks earned her the sobriquet "Irrigation Queen of the High Atlas".

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