I agree with 'brianloughran55' review of this Channel 4 UK comedy series. People outside the UK, or London to be more precise would not understand much of the humor.
There is an accent in London now in the younger working class generation that is a mix of Jamaican, Cockney and Yardie and it sounds just like that of Lance's Phone Shop employee's! I have sat on the train many times and listened to these people babbling on and it seems the stronger the accent and lingo the more thick they tend to be.
Another thing is that if your just hearing and not seeing who is talking you would never be able to guess their ethnicity.
Still, these colorful characters always unwittingly put a smile on my face so don't worry if you forget the paper when boarding the Victoria to Folkestone train.
I recommend watching an episode from the new series called, 'Baking Bad'. Just total comedy genius!