Planetary nebulae (PNe) represent the final stage in the evolution of low- and intermediate-mass stars, forming from the mass ejected by the star during its AGB evolution before being ionised by the star's, now exposed, core. Binarity has long been believed to be responsible for the vast array of observed aspherical morphologies, but it is only recently with the advent of time-resolved photometric surveys (both wide-field and dedicated) that the critical influence of binarity has been demonstrated observationally. Here, I will present the results of these surveys, highlighting their importance in understanding the formation and evolution of planetary nebulae as well as binary evolution in general. A system of particular interest is the central star of Hen 2-428 which has recently been shown to be a super-Chandrasekhar, double-degenerate system that will merge in approximately 700 Myr, and thus the best double-degenerate, supernova type Ia progenitor candidate known.