I've finally caught up with this and am glad I did. It's all perfectly charming, in the best sense, and contains engaging characterisations by a talented bunch of actors, led by Richard Wilson, David Tennant, Samantha Beckinsale and more. Some of the shore-side characters are a bit OTT silly, but they act well. OK, the plots aren't Shakespeare nor Pinter, much less Russell T Davis, but they are entertaining enough, with well-paced dramatic and comedic touches to keep the viewer occupied. The pastel-tinted scenes of life along the Thames are rather lovely. My main gripe is with the senior officer, played by Geoffrey Hutchings, a dysfunctional bundle of neuroses and forgetfulness. He bored me to death, but the acerbic yet never cruel wit of Wilson made up for it, as did the big-eyed naive decency of Tennant's 'Darwin'.