Ralph Thomas and Fred Griffiths made 6 films together, and the 3 rated ones average 6.17, 0.14 below their career marks. The best is Doctor in the House at 6.5.

Ralph Thomas averages 6.00, Fred Griffiths averages 6.62. Apart that suggests 6.31; together they average 6.17, a lift of −0.14.

Lift is the average of their films together minus the mean of their two career averages.