SAVING GRACE  Movie (R)  A middle-aged British widow, with a green thumb, Grace (Brenda Blethyn) has just discovered that her recently deceased husband has left her with an enormous debt when her gardener Matthew (Craig Ferguson) asks her to help him tend to his small, personal-use marijuana crop. Grace soon realizes that they can turn her green house into a hydroponics laboratory and turn out a profitable crop--if only they can keep the local constables at bay and then find a dealer to actually sell the stuff.  Hilarious! And if you love Brenda Blethyn in the series Vera, you will love this totally different persona.