I never saw Chas and Dave live but saw lots of them on TV and probably have several of their singles in my collection managing to span rock and roll, cockney knees up, music hall, pub sing-a-long music and Londay Folk in to their own unique brand of music call "Rockney".
Their Wiki page is here and there are more in depth tributes such as this one here.
They had worked in many sixties bands and formed in 1975 , opening for Led Zeppelin at Knebworth in 1979. They were loved by everybody regardless of your own musical tastes, if Chas and Dave came on the radio or on Top of The Pops, you never complained because it was a breath of fresh are and a fun interlude and they could also talk.
The had a TV series in 1983 set in an East End pub, but I don't think they ever appeared on EastEnders but it is sad that the duo is now split, but we do have a lot of lovely memories.
Hopefully now I have calmed down enough to try to get back to sleep, but I'll leave you with their breakthru single "Gertcha" from 1979.
Sleep well.