Billy Vunipola hopes strong Saracens comeback will convince Eddie Jones

• No8 aiming for England’s Six Nations squad after return against Wasps• ‘Injury taught me a lesson about looking after myself – recovery and sleep’Billy Vunipola believes he will be back to his best form in no time after making an eye-catching comeback from injury against Wasps on Sunday.Last week Eddie Jones questioned whether Vunipola would be fit enough for the start of the Six Nations Championship, describing the No8 as “short of a gallop”, so his first outing for nearly four months can be considered an emphatic response. Related: Billy Vunipola stars on return as revitalised Saracens see…