A woman suffered a “very serious sexual assault” at knifepoint as she walked to work at the weekend. The attack was believed to have been thwarted by a jogger who saw what was happening and called police.Superintendent Nicholas Pedro said this afternoon: “The 31 year-old victim was walking to work when she was accosted by a man who is described as being about 5ft 10in and brown-skinned, riding a red motorcycle.”It would appear that he rode past her and then rode back towards her and