A lot of good ideas in this thread on how the show was and how it could have gone. I'm a bit late to the thread but would like to add a little of my thoughts.
I was really enjoying the characters of Billy, Alvin and Entwhistle as they appeared in more episodes. Thought they made a great trio to possibly take over the shenanigans as Clegg and Truly were no longer able to do. So was sad to see the shift to more of the Captain, Morton and Hobo team. I did not know why Billy left the show till this thread. Sorry to find that he had back issues and was unable to continue.
I do like the Morton and Barry adventures, found them likeable characters who could be friends. Even liked it when Glenda went about to fix up Morton with a girlfriend. Felt the four of them could have provided some nice writing potential for the show. They were young enough to also help take some of the load off of Clegg and Truly.
I liked Trevor in 'Are You Being Served?' Was alright seeing him on the golf course for a few minutes a show. Yet, for some reason just did not care for him as he took on more focus and eventually moved in beside Barry and Glenda. Seemed all he cared about was getting his things back from his wife or having Morton do all his chores.
Russ was great as Basilton Bond. Watched many a show long ago. Just thought him too wanna-be Foggy-like in character when the show's focus shifted to him. If he had toned down the over the top secret spy angle a bit I think I could have liked him more.
Miss Davenport as a character was starting to grow well. I found it devilishly charming of her to have some fun with Barry by tricking him into thinking she fancied him. I liked that more than the timid side her character showed. She and Glenda could have made good pals and would have been nice to see Marina added to their friends group. Can see the three of them sharing tea as the original ladies did. To have them chat about men and for Glenda to discover the things she missed when she was told to "Drink your coffee!" by Edie. I know the older group of ladies shunned Marina but would have been nice to see the younger group of ladies take her in as a friend. Obviously, I would not expect Marina and Pearl to sup tea together.
I liked the banter with Tom and Smiler and their dealings with Auntie. Tom's character became more likeable as I saw him in more episodes. I can see Smiler doing less physical things as he aged but am not sure why Tom did not join in more with Barry and the younger guys. He could have joined in with Barry, Glenda and Morton. Or even with Billy, Alvin and Entwhistle to take over from Clegg and Truly.
It was nice to see more of Cooper and Walsh taking larger roles. I like these guys and felt they could of had a stronger presence in the show.
The final season did at times seem like a long continous episode about Howard and Marina. As much as I like the two characters, I prefer them as secondary to the main characters.
Ideally, I guess I would have liked to see the show to have carried on with Billy, Alvin and Entwhistle as the new main group with possibly Tom too. Still having Clegg and Trully around for less physically demanding roles. The two of the of them sitting somewhere having a drink and reflecting over the activities of what else is going on in the show. Glenda, Barry with Morton and his ladyfriend as the second main group. Heavy showings of Cooper and Walsh to add their humor. Marina, Howard and Pearl doing their thing. Alvin and Stella with their banter. Miss Davenport, Auntie and Ivy continuing to run their shops. The ladies still having their tea gatherings. Plus some Tom and Smiler mixed in there as they were able.
On a side note about Alvin, I have come across a few episodes of 'Man About the House' and 'George and Mildred'. Enjoying watching him in those. I can see where the American sitcom 'Three's Company' got the inspiration from. I remember enjoying that show as a kid. Enough babbling from me at the moment.
Cheers,
Rick