A group of intrepid explorers braved exhaustion, altitude sickness and 15-hours of walking to summit one of Africas highest peaks.Cancer-survivor Heather Walters has started a fundraising campaign to open North Devons first cancer support centre, and to kickstart the appeal, seven of her friends and family summited Mount Meru in Tanzania. Heathers husband Tristian said the trek - which has raised around £5,000 - was both amazing and exhausting. He said: It was a proper once in a lifetime experience, but I dont think we knew just how hard it would be. I think some people were taken right to the threshold; had it not been for the cause I think some of us wouldnt have made it - but we did. I never thought I would get emotional but all I could think about was Heather and the kids, and I just burst into tears when I saw the summit. It was just a fantastic experience. Heather said plans for the new cancer support centre were progressing well. Hopefully we will have some more news in the next month or so, she said. The trek, which was also in aid of the charity Coppafeel, brings Heathers total fundraising to around £35,000. Her efforts have included hanging bras from Youings in Barnstaple and auctioning celebrities underwear.