 Complete the following phrase:  Allison resigned in 1947, a year after professional football resumed, and his position was taken over by Tom Whittaker, the clubs first-team trainer. Intent on playing an expansive style of football, he purchased Don Roper and converted Ian McPhersons position from defender to winger. The changes had the desired effect as Arsenal won the 194748 First Division championship. Whittaker won the clubs third FA Cup in 