内容摘要："I really want to do it so people understand the value of what a stem cell transplant can give to people with blood diseases and their families. It's another chance at life," she added.

"I really want to do it so people understand the value of what a stem cell transplant can give to people with blood diseases and their families. It's another chance at life," she added.

"I'm feeling pretty exhausted, I have very sore feet, but it's nice to be back in civilisation," she added.The solo trek across Baffin Island - Canada's largest island - took Ms Hempleman-Adams from Qikiqtarjuaq to Pangnirtung, through Auyuittuq National Park.

Her father, explorer Sir David Hempleman-Adams, flew out to Canada to meet her at the finish line."What she's achieved is quite extraordinary," he said."I was really, really worried. She was right on the edge. It was wind speeds of 30 knots [34mph], and that's just dangerous in these temperatures.

"Being solo, you've got to be really on top of your game the whole time. If you just lose concentration for five minutes, it's a real problem."I'm immensely proud of her."

On completing her challenge, Ms Hempleman-Adams, who now lives in London, said: "When you go in by yourself, you just have a mindset to keep going.

"You adapt, you have the mindset that you can't give up. There is no giving up in those conditions.Dates of birth and online order history may also be among the data stolen.

But it does not include useable payment or card details, or account passwords, M&S says.The retailer will prompt customers to reset passwords for "peace of mind".

It adds that while users do not need to take any action, they should remain alert to possible attempts to extract or misuse their information.M&S's problems began over the Easter weekend, with customers reporting problems with Click & Collect and contactless payments.