The Garnetts have been moved from Wapping to a town outside of London, represented by Hemel Hempstead (see Reel Streets, here, for a full set of identifications).
Actually the high-rise block where they live is still in London. The John Walsh Tower is one of a pair built in 1966 (see here). The other is called the Fred Wigg Tower:
Actually the high-rise block where they live is still in London. The John Walsh Tower is one of a pair built in 1966 (see here). The other is called the Fred Wigg Tower:
The pre-credit sequence shows views of the London they have left behind, and performs a neat visual trick to mark the move from old to new. We see a terrace of houses in Wapping, due for demolition:
Then that view is flipped on its side and has superimposed upon it a view of the tower block:
This is probably the best thing in what is a mediocre film, but I also like the credit sequence that immediately follows, in which to the façade of the building are added panels upon which the credits are displayed:
The Alf Garnett Saga picks up the story from the end of Till Death Us Do Part (1969), but if the Wapping they left behind in that film is similar to the Wapping we see three years later, the high-rise building to which they are moved is not the same one:
This is the 1950s-built Alton Estate in Roehampton, S.W.15, seen two years earlier in Truffaut's Fahrenheit 451: