If you have been left shivering by the recent cold snap, spare a thought for a security guard preparing for a 379 mile hike across a frozen Siberian lake.

Heathrow worker Craig Marriott described the two-week challenge, which involves hauling an 80kg sledge through 124mph winds and -40C temperatures, as a birthday treat.

The 25 year old was inspired to take part in the Siberian Black Ice Race after watching Olympic rower James Cracknell’s TV series On Thin Ice about the South Pole Race.

He said: "My friends and family think I’m crazy. With the snow at the moment they are wrapping around with multiple layers.

"That I’m going somewhere with temperatures of -40C seems a bit crazy to them.

"I have been looking for a good challenge for a while to sink my teeth into.

"I’m doing it not for the excitement but more so I complete it – the sense of accomplishment. It will be something to say I have done, and I’m proud of."

Mr Marriott, who lives in Auckland Road, Kingston, previously camped in the Scottish winter, and will set off on March 15, his 26th birthday.

He expects to be alone for most of his time on Lake Baikal, the world’s oldest and deepest lake, although there will be a check point at the half way point.

He said: "I’m looking forward to being in that environment. With the dimensions of the lake, if I’m in the middle of it I will just be able to see the flat surface – it’s pretty unusual."

His sledge will contain two-week’s worth of dried food, and his daily calorie intake will rise from 4,000 during training to 6,500.

Mr Marriott’s flat mate, who has arthritis, inspired him to raise money for Canine Partners – see justgiving.com/marriott-siberia.

However, he will let the train take the strain after completing his trek, with a return journey booked on the Trans-Siberian Express.