The unique relationship between Nora and Compo was enduring and probably unparallelled in the series. However I think the rapport between Nora and Alvin was one of the success stories of the post Compo years. Alvin continued with the practical joking, teasing and tormenting of his next door neighbour but also I loved the pretence he maintained that Nora actually fancied him and how he would would jokingly remind her that he didn't feel the same about her. A very different relationship in that sense but a charming one nonetheless.