The growing sample of exoplanets that transit their host stars are providing a wealth of new information on the composition, structure, evolution and atmospheres of the exoplanet population as a whole. Results from the WASP survey provide the best constraints on the population of hot Jupiters, while recent results from the CoRoT and Kepler spacecraft are extending these studies to ice giants and terrestrial planets. I will present results on the occurrence rates and atmospheric properties of hot Jupiters using the WASP sample, and I will also describe a new project aimed at finding super-Earths around bright stars: the Next-Generation Transit Survey (NGTS).