On a Clear Day

On a Clear Day is a 2005 Scottish drama film written by Alex Rose and directed by Gaby Dellal. It stars Peter Mullan as Frank Redmond, an engineer in the shipyards on the River Clyde, who becomes stagnant and quickly sinks into depression following his redundancy. A naturally strong swimmer, Frank gets an idea while on a 'booze cruise' with his friends to swim the English Channel. Featuring an ensemble cast, it co-stars Brenda Blethyn, Sean McGinley and Billy Boyd, among others.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.