My only complaint about Series One was that there weren't enough episodes! Thank goodness they got this, Series Two out in very good time. The same characters return plus a new figure in MI6 Agent Simmons who really does both compliment and add to the series.
The Sweeney set new standards and levels of what was capable of being produced and acceptable on television. The Fixer goes even further and to an even higher level. All the(now) five main characters play their parts very well and full marks to both the casting director and the producer. Johnny Mercer once again plays his part exceptionally well, especially after what he has been through, and is again even more convincing and also very ably augmented by the other four whom nothing either should be taken away from. Not a weak character in place.
Don't really want to say anything about each story as it will spoil it for people who haven't viewed yet. However what did make me really laugh was when some "Psycho" type villain returns from living in Spain to mastermind a large job and has the audacity to call Mercer a "Psycho!"
Only complaint again is that there weren't enough episodes, still I am sure that it will not be long before Series Three is realeased