Search in the box using a valid UK postcode and you should be shown a list of address,
postcodes and their EPC ratings, the amount of CO2 they emit every year,
internal space in square metres and the EPC date.
There's a bunch of reasons why the postcode you searched for doesn't return the results you expect.
We've written an article about why this happens here.
Once shown, click the column headings to sort the results.