By GARY FITZGERALD

BILLY Vunipola is back on track to return to the Saracens front line and has remained upbeat and positive about his playing future.
The England No.8 looked set for another spell on the sidelines after being helped from the field early in the recent European clash with Edinburgh.
Vunipola, 29, who has been linked with a move to Bath at the end of the season, twisted and landed awkwardly on the artificial surface at StoneX Stadium. It was a worry for the big forward who had just returned from a four-week absence with a knee problem.
He has been beset with injury concer...