The produce is from the Deli counter i.e. the open containers that they fill for you. However, as you will see from George's picture, they also prepare it ready in containers at the side.
I doubt there is any regional variation in the recipe being sold. The Dhansak, may not be everyone's cup of tea but I am sure the Sag Aloo will go down well.
As I said, I am not comparing these dishes to anything BIR, just that I was pleasantly surprised at the finished dish being palatable, which for all intents and purposes, is not something I would say about supermarket Indian style dishes in the main.