1. Introduction

2. Identification of the CORNISH UCHII sample

3. Radio properties of the CORNISH UCHIIs
3.1. Lower-resolution radio counterparts
3.2. 5GHz–1.4GHz spectral indices
3.3. Evidence for short-timescale UCHII variability?

4. Distances
4.1. Distances from ATLASGAL and RMS
4.2. Distance estimates for remaining sources using CO data
4.3. Resolving the KDA

5. Derived physical properties

6. Infrared properties
6.1. Associations with mid-infrared data
6.2. Associations with near-infrared data and extinctions

7. Spectral energy distributions and bolometric luminosities

8. Comparison of UCHII search methods in blind surveys
8.1. Sub-mm – ATLASGAL
8.2. Mid-IR – RMS
8.3. Previous radio surveys of the Galactic plane

9. Summary