Late 1950's Lardy Cake a Sunday treat at my grandparents in Wandsworth.
Complete with a couple if pints of winkles.
As far as suppliers are concerned down south I have no info.
Here in Shropshire we have a Greggs bakers (are they nationwide?) in the
town, if you have Greggs down south try their "Dripping Cake" its
identical if eaten warm with a large amount of butter. Got plenty of
recipies if you want to have a go at your own.