I think I know the shop under discussion
Let's say - they had their data processing operations in Osterly and were known for a shop building in Knightsbridge that was bedecked in lights?
Frankly, it's a miracle that they were running anything at all. I remember a summer working in their credit department where the workers had the thrilling task of microfilming credit card applications. One page at a time. It was like the sheet feeder had never existed.