Whats Its Name? British Gangster Movie!!! Help

[donsash]

Hello, I'm looking for the name of a British Gangster movie I saw a couple years back. This is all I remeber about it:

2 Guys take their former boss down to the beach, he's kneeling on the stones and they are about to kill him.

But he has a sword (or a gun) And kills them both, but looses 1 hand in the fight.

He then goes to take on the big boss and kills all the bodyguards on the way to get him.