Billy Vunipola’s hamstring adds to England’s injury worries

• Saracens No 8 pulls up after ‘feeling tightness’ in training
• Eddie Jones to name South Africa tour squad next weekBilly Vunipola’s hopes of an injury‑free end to the season have suffered another setback after the Saracens No 8 pulled up with a hamstring problem at training on Wednesday, having only just returned to action after a broken arm ruled him out of the Six Nations.England, who are due to name their tour squad for South Africa next week, now fac