Not exactly.London was formed because of the split ownership of UK and US Decca.London was able to release US label material in the UK which could not be labeled Decca.London is a UK corporation (or was).A Decca UK LP doesn't necessarily have a London Records counterpart.Check the Stones early Decca releases vs. London.Decca US was started in the early 30s releasing Country and Western.Later they made Soundtrack and Original Casts a major part of their catalog.Check Wikipedia on both these labels.A short fascinating read did I mention Deram?The unipivot?One of my personal faves Delia Derbyshire?