Ultracompact (UC) HII regions represent an early embedded stage of massive star formation. This phase signifies a massive young stellar object (MYSO) that is typically around 10^5 years old. We have identified a complete sample of UC HII regions from the RMS and CORNISH surveys of Urquhart et al (2014a,b) and their embedding molecular clumps from ATLASGAL and SASSy submillimetre surveys. The sample covers regions over a range of galactocentric distances which allows us to investigate the massive star formation rate and star formation efficiency across the Milky Way