It was a "London Steak House" not "Dulwich Steak House" - part of a small city-wide chain before beef prices went through the roof and red meat got a bad name. Various cuts of steak served with frozen chips and frozen veg and expensive rubbish wine. Quite popular though as then, as now, the good burghers of the Village were all tightrwads where paying for decent scran were concerned. So it will be another chain.