I think Cassandra and Raquel added something to the show and I am pretty sure it would have run out of steam sooner on it's original run if they hadn't let the characters develop.
Gra - that David Daker episode if one of my favourites with Grandads comment about having to think twice about a womans of Rodneys birds age still capable of creasing me up. The character of Grandad was superb and made most early episodes for me, he may not have had a lot of lines but what he did have would normally steal the show and even David Jason is on record as saying that. Another favourite Grandad line is I think from the first series when he and Rodney are arguing about how you pronounce Sidney Poitier, with Grandad preferring Potter, brilliant.
Strangely enough the last listing for Lennard Pearce (Grandad) in IMDB was in Minder in 1984.
Watched "The Yellow Peril " last night , & this also features another brilliant Grandad moment , where he proves he is not always " a soppy old git " .
When Trigger explains to Del & Rodney , that the paint is not used on trains , but for painting signs in tunnels , he suddenly pipes up , a couple of minutes later with "Tunnels ? you said they use the paint for signs in tunnels , how can you see a sign in a tunnel , it is pitch black ? " . On realising it was luminous paint , their reactions were absolutely brilliant , especially when it dawns on Del , he has painted their mother s grave stone with it .
Another Grandad moment, but I can't remember the episode, was when he was telling Del the story about when he was a security guard at a factory that made cases and the 'Sweeper Upper' was very grand in appearance and left work each morning with a case, but Grandad being an astute judge of character and knowing he was a wrong'un made sure he checked him every mrning when he left, but never found anything on him.
It was only when the 'Sweeper Upper' left that they discovered a whole load of cases had went missing.