George Kruis’s delayed return adds to England’s Six Nations worries

• Saracens’ injured lock forward will not play any club rugby before Six Nations• Mako Vunipola could be ruled out of tournament entirelyThe good news for England is that some key cogs should be back available for the start of next month’s Six Nations championship. Less encouraging for their supporters is the danger of almost half the pack being worryingly short of match practice before the defending champions’ opening game against France at Twickenham on 4 February.With Chris Robshaw, the Vunipola brothers and Manu Tuilagi already hors de combat it has emerged that the lock forward George Kru…