BlackBerries are being turned on. Researchers are receiving instructions. The MPs end their Arctic trek.

Forgive any typos - my hands have thawed but are still aching. It's been a very long, very tiring and somewhat painful day. It was -27C when we set out, and the first 30km or so were hard work - uphill almost all the way.

Maybe the cold and exhaustion are taking their toll, but watching the aurora borealis is a strangely emotional experience, writes Tania Branigan.

A night in an igloo isn't the best preparation for a day's sledding, finds Tania Branigan. But while there are Abba songs to be sung, the MPs' mood is holding up.

In the (relative) warmth of an igloo, the Arctic-trekking MPs get down to business, Tania Branigan reports.

Day two of the Arctic challenge. Tania Branigan learns that huskies can work at -60C and relieve themselves on the run.

Day one of Tania Branigan's trek to the Arctic with MPs. Day one: the locals say it's not that cold.