Two South Wales sisters have pledged to do 20 challenges for 2020 for Macmillan to mark 20 years since they sadly lost their mother to breast cancer.   Sisters Verity Pyke, of Cardiff, and Lauren Turner, of Bridgend, want the public’s ideas for their 20 fundraising challenges for Macmillan Cancer Support in memory of their mother Susan Turner, who sadly died in 2000.   So far, the pair’s 20420 challenges include a family climb up Pen-y-Fan, a zip wire…