The Long Good Friday (1980)

Harold is having a very bad day. He should be finishing the biggest deal of his life, schmoozing the yanks into big investments, but bad things are happening. A bomb's found in his casino, another nearly takes out his mum and a couple of his boys have turned up dead, if they've turned up at all. Is it a new mob trying to muscle in or something much more serious?
Director John Mackenzie, best known for the tv series Play for Today, gave Bob Hoskins the part he was made for in Harold the gangster. Helen Mirren is as glamorous and talented as ever  and solid character actor P.H. Moriarty puts in a great turn as hard man Razors.
Keep an eye out for a young Pierce Brosnan as 1st Irishman.
This is a classic and classy British gangster flick that works in every way.

http://www.imdb.com/title/tt0081070/?ref_=nm_flmg_act_69