The series was titled BLAKES 7 and it was about a group of criminals fighting against a tyrannical government that used mind control and death squads to control the population.
It was dark, gritty and did not end up a happy note, but has to this day a cult following larger than even Doctor Who.
Here is a series of clips from the series to give an idea of the whit and witticism in the writing especially by one central character of Avon.