Just over halfway through the series, thought I'd bump this thread to see how it is being received by the comedy cognosceti.
Personally, I'm liking it (but no more than that). We're seeing a similar phenomenon to other successful long-running comedies, insofar as the central characters are well established and explored by now, and the use of some gimmick or other (eg guest stars, tenuous mis-understandings, some freak occurence) is becoming more prevalent. Not that that's necessarily A Bad Thing, I just see the evolution from the Chewin The Fat offshoot into a full blown saga. For me, series three is always a bit of a watershed in that regard (think how Scrubs changed at S3).
ep 3 - 'Lights Out' was, IMO, the best yet. I think Isa is one of the most under-used characters, and I'm really pleased to see them using her more now. The actress playing her (Jane McCarry) has the Scottish old lady facial expressions and mannerisms down to a tee. OTOH, I think they have tried too hard with Navid to make him more than a shopkeeper, and it's not really working for me, much as I like the character and Sanjeev Kohli.