I grew up in London at the time this series was made so, for me, this show is mainly about the nostalgia fix. So many things in every episode bring back memories - from the coffee cups to the clothes and the dreadful decor of Randall's apartment. But the show has many other qualities, especially its dry humour, and it remains one of the best TV series of its time and genre.
There is some lovely acting (mainly from Mike Pratt), a really delicate examination of the concepts of friendship, loyalty and love, and some brilliantly conceived stories. Set aside any cynicism over what you may or not believe about ghosts, and ignore the dated technical aspects of the show, and just enjoy the series for what it was meant to be - great entertainment.
In addition to R & H, and Jeannie (who, let's be frank, is a bit of a bimbo), the show portrays some marvellous characters, especially the various police officers that Randall loves to hate, and there are many cameo appearances by some well-loved actors who later became very famous indeed.
Mike Pratt is seen with an almost continual supply of cigarettes and glasses of whisky in hand so it should come as no surprise that he died young not long after this series was completed. His death was a great loss to British film and TV and he is much mourned - by me, at any rate. I have watched this show over and over again and I'm sad enough to know almost all the dialogue by heart. And sad enough to admit it!