Everyone's being far too polite.

To the OP: please tell us, what are your requirements?

Seriously, you're mentioning supermarkets of a particular size and excluding some, but if we could understand exactly what it is you were after, we could genuinely offer you solutions.

For example, smaller branches of Tesco may give you what you need. As will Waitrose as they price-match.

But, you seem to have decided there's a certain floor space criteria, and exclusion of one particular competitor.

In the nicest possible way, please enlighten me/us as to what it is you really want .