Watching her son Kyle steamroller through flailing Australians like a ‘runaway rhino’ to score a vital Rugby World Cup try for England on Saturday, Donna Sinckler could justifiably feel huge satisfaction. It was she who raised him on a tough South London estate, shielding him from the gang violence that ensnared many of his friends and ferrying him to and from training despite working 12-hour shifts as a police call operator. Her son’s stunning performance in Japan – which she saw from the stands – helped England vanquish old rivals Australia 40-16, setting the stage for a semi-final clash with the mighty All Blacks of New Zealand. If the squad has come a long way since embarrassingly crashing out of the last World Cup – hosted by England – in the pool stages, then Kyle has come further still. The 19st prop forward’s first international try exemplified the team’s spirited victory. Kyle Sinckler breaks clear to score England’s third try during Rugby World Cup 2019 Quarter Final match between England and Australia Sinckler holds off Australian player Kurtley Beale as he touches down to score his team’s third try A young Sinckler pictured with his mother, Donna Sinckler in an old…